I'm not sure how it might slot in with other variables as far as effective spring rate, but to get the right look (assuming that's a concern) the spring should only have coils along roughly half its length.
Kurt Sperry Bellingham Washington USA
2009/6/14 Harvey Sachs <hmsachs@verizon.net>:
> Jerry Moos asked: <snip>
> I've bought a Simplex RH brazeon shifter on UK eBay and a Simplex Rigidex
> 4-spd chainstay mount RD missing the return spring. Bought assorted
> throttle return springs at the auto parts store, but they are all too short,
> at least to reach the eyelet on the chainstay that I take to be the forward
> anchor point of the return spring. Any suggestion?
> +++++++++++++++++++++++++++++++++
> Jerry, I think you went too hi-tech in starting at the auto parts store with
> throttle return springs. Drop by your local hardware store and look at the
> screen-door springs. In my experience, they aren't hard-tempered, so you can
> even cut one down and bend a new hook on it...
>
> harvey sachs
> McLean Va
> (back from Indiana and California)