Howard, I was wondering how to increase the preload on the rear springs. How do you fit an inner spring? Do you need to modify the claw?
What about the longer Petteford springs? Do they foul the battery case? Should I consider the Thornton system? I am in a receptive state of mind here.....
Alyn
I'm not an expert on Vin cycleparts, I've had an Egli since 1974, and I raced (at least I was on the track while other people were racing) a very special Comet for a few years.
The Comet had features such as home made TLS brakes and all-in-one spring damper unit on the Girdraulics, so the rear suspension may have been altered too, but I've nothing to compare it with.
I think there was an extra shoulder on the claw, to locate the inner spring, so that was probably a non Vincent Mod. Also when I look at the parts list the springs seem to be slightly conical at the ends, if this isn't draughtsman's licence, my outer springs were non standard, because they were parallel.
For more preload you need to screw out SP4 mounting eyes, but you'll have to make sure there's enough thread, they look short on the parts list, so you may need special ones made.
As I understand these things, there should always be some compression when stationery with the rider on, so if you go past that point, you need to fit higher spring rate springs, and back off the SP4 adjustment again.
I hope that reads ok.
H