• Welcome to the website of the Vincent H.R.D. Owners Club.

    Should you have any questions relating to the Vincent H.R.D. Owners Club, or Vincent H.R.D. motorcycles in general, please contact Graham Smith, Hon. Editor and Webmaster by calling 07977 001 025 or please CLICK HERE.

    You are unrecognised, and therefore, only have VERY restricted access to the many features of this website.

    If you have previously registered to use this forum, you should log in now. CLICK HERE.

    If you have never registered to use this website before, please CLICK HERE.

Restoring the last of the series "A" Comets.



greg brillus

Well Known and Active Website User
VOC Member
Earlier up on this same page shows some of the clutch/brake lever assemblies showing the square head screws holding the clips to the perch. Can someone give a good picture and/or dimensions of these screws, It looks like the hex is about a 2 BA spanner size, and I'm assuming the threads are 1 BA. I will probably get a small batch made if anyone wants/needs them. Unless someone knows of some available somewhere........... Cheers............. Greg.
 

greg brillus

Well Known and Active Website User
VOC Member
Once I get a drawing or similar with some details I will see my machinist about making a small batch and will let you know. It would be good also to know what the original finish on them was, either cad or chrome plating I guess. And was it only the two main levers that had them..........Clutch and brake, what about the other lever attachment screws.......... ?
 

vin998

Well Known and Active Website User
VOC Member
I made the strange handlebar lever screws for my A and they were right swines to make. I didn't have an original to copy at the time so did a bit of guessing looking at photos of others. The square head I made to fit a 2BA spanner and the thread was 7/32 BSF. This is virtually identical to 1BA and I tried both size of screws in my lever brackets and 7/32 BSF fitted the best so that's what I went with. You need to look at the threads in the levers you are using. You don't want to use the wrong thread and find it strips out of the lever bracket when you pull the brake on hard.
These strange square head screws were only used on the clutch and brake lever. The other levers just used cheese headed screws which have a very slight dome head. I think they are called slotted fillister screws and Amal used them a lot.

Don't forget these screws were probably made by Amal and not peculiar to Vincent's and most probably not always what Amal provided as they would have been expensive compares to a std slotted screw..
Like a lot of things Vincent would just use what they received from Amal or Miller etc. Its the same reason on series B's bikes were fitted with 6.5" headlights and 8" headlights at the same time. Vincent just ordered a Miller lighting set and fitted whatever Miller provided on that day.

Greg is correct that the decompressor was the short type that has a gently S bend to the lever.

Simon
 

A_HRD

Well Known and Active Website User
VOC Member
Greg,

Sorry, but I have an alternative view! A few years ago I made up 2 pairs from an alleged rusty original as follows:
Starting from the square end and working along the bolt:
Rounded end - likely 5/16 rad. 5/16 A/F square (so is Brampton spindle) and 5/16 long,
Then tapers into a waisted radius, 1/4 dia at min point, 3/32" long.
Then a 5/16 dia parallel shoulder, 1/8th long.
Then the "stud" part:- 1/4 dia, 5/8ths long, with 1/2 inch of 1/4 BSF thread.

Like Simon says, go with the thread in your lever brackets!

I haven't got the time at the moment, but I'll see if I can draw-up a dimensioned sketch and post it in the next 24 hours...

Peter B
 

Bill Thomas

Well Known and Active Website User
VOC Member
That's funny Peter, I have just found one, And picked up a 5/16" spanner, And thought the same.
As you know, I am + or - an inch !!.
Cheers Bill.
 

vibrac

Well Known and Active Website User
VOC Member
Some of the confusion is because Amal is 1BA and Docherty and others were 1/4X26 whenever I have to do the job now I use 1/4 cap screws I found I could get the torque out of those to keep the scrutineers at bay and the habit has continued if I have a problem
 

greg brillus

Well Known and Active Website User
VOC Member
Thanks very much Peter, that is excellent.............Just need to decide if we go stainless or cad plated steel. I'm leaning towards the plated steel just like all the other small steel items back then, excluding a black parkerised finish. I will get some machined up and go from there. Plus the threads will probably be 1 BA I have never seen a perch with 1/4 BSF threads, and I have quite a large collection of handlebar levers and perches. Not saying that they weren't that size, only I don't have any........Let me know if any of you need of want a different thread, or other ideas's for same. Cheers...............Greg.
 

Dinny

Well Known and Active Website User
VOC Member
Hi Greg,

I will have enough to do my bike (4) and my levers are standard Amal threads which I believe is 1BA. I would be happy with ss or plated.

Cheers
Mark
 

vin998

Well Known and Active Website User
VOC Member
Is it certain that all Series A’s had these, or like some other parts, whatever the supplier sent?
I suspect you are correct and it all depends on which handlebar levers Vincent received from the suppliers and so fitted at the time. I know some of the early series A's (1935) were fitted with Amal Tidybars which were different to the later setup.
 

Dinny

Well Known and Active Website User
VOC Member
My thinking is they were period parts, whilst it's unknown what was fitted to each bike they will fit in nicely and be a bit different from the later screws.
 

A_HRD

Well Known and Active Website User
VOC Member
Interestingly, my TTC20 had them (ordered Nov 35, delivered Mar 36). And so did Glyn Baxter's A Twin (the first production one) and a colleague's late A Twin, as well as a mid-37 Meteor of which I am aware. So who knows? Lost in the mists of time I'm afraid...
Peter B
 

Clay

Active Website User
VOC Member
Hi Greg, Chankley Bore asked me to check my Series A lever screws so I took one out to photograph and measure. I've set the vernier to mm as I thought it might be easier to covert for you but let me know if you want in inches.
It is slightly different to the schematic above and the pitch is 26 tpi.
Let me know if you need anything else.

IMG_9847.jpg IMG_9848.jpg IMG_9849.jpg IMG_9850.jpg IMG_9851.jpg
 

greg brillus

Well Known and Active Website User
VOC Member
Hi there Clay, Thanks very much for the pictures, they are excellent. It is unusual for the threads to be so large in diameter, I have never seen a lever perch with the threads that large. Still I haven't had much to do with any pre-war bikes either, mostly all post war. I'll give the pictures and dimensions to my machinist to make copies of them, thanks again..............Greg.
 


Top