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ET: Engine (Twin) 2BA Countersunk Screws (406)


Well Known and Active Website User
VOC Member
Is there any trace of gear crunch when changing from neutral to first? If yes it is definitely the clutch
one 2ba countersunk screw wasn,t happy staying where he was all sorted now thanks for all your replies.OSSIE


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Well Known and Active Website User
VOC Member
There are big screwdrivers and small screwdrivers and one that's the right size and that's the one they used at the factory back in the 50's
It doesn't help at roadside, but it is a good idea to have a dedicated screwdriver in the shop that you have ground to fit just right in the slot.

Peter Holmes

Well Known and Active Website User
VOC Member
Vic, The standard screw has always been a pain,
If you think the head is countersunk, There is no support for the slot at each end !,
So easy to round off, Plus we used to pin pop the plate into the screw slot,
So it wouldn't come loose, But we have all seen that one would !.
Cheers Bill.
Well Bill you surprise me, if you have access to a bench grinder buy yourself a decent brand screwdriver, preferably oversize, hollow grind the flats until the blade fits the slot precisely, then grind the blade overhang in slot to same angle as the countersunk screw, taking care when you are grinding never to overheat the blade, a jam pot filled with cold water with an ice cube in it helps here, I have kept my pilot clutch screwdriver for that use for a very long time, it is capable of doing the 9 screws up very tight, very quickly without slippage or damage to the screw heads, as I have said in a previous post, I have had to do this a few times, I have experimented with Allen headed screws, but soon reverted back to standard, the only types I might change to is Pozi or Torx, but as previously stated, they are not easy to come by, if available at all.

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