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I've basically installed, uninstalled and dismantled 2 derailleurs twice. I think I did chain length by the shimano Largest sprocket + 2links if I remember correctly) method, which others seem to say they have used with some success (can't remember where I saw this suggested).
No video I'm afraid, it shifts and runs fine when there is no significant force on the pedals (ie on a bike stand) but as soon as I'm actually trying to ride it, it sort of skips or bounces as you apply weight/force on the pedals- as I say the tensioning arm gets pulled forward a little like the chain is sticking in the derailleur or something.....creating a skip in the chain. It works fine on the two largest sprockets and runs/pedals smoothly.
Just cannot figure this mech out!
jeff80-
Peter Underwood suggests that method to get the chain length.
Big_Block
any video of the gear changing?
if you remove the chain, does the derailleur move just past the smallest sprocket (to allow for an overshift to get it in gear)?
It may be the chain length; how did you determine the chain length?
I have the that Simplex model 3 speed 1/8" on my 1948 bike. Moves correctly. The initial setup took a bit of time following the instructions.
This involved starting from scratch and following the instructions carefully. Each time it seemed to improve my application of the instructions.