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@jeff80
Just a question for anyone who has and has set us a Simplex Tour de France rear derailleur - I can only get mine to work with a very slack change-I already had a disaster with on when it over shifted into the wheel, now my replacement one, which only seems to shift a 3speed block, will only cover the full range when the chain is very slack indeed-so slack it falls onto the chainsetays when oil the smallest cog.
I've already had to adjust it rather further than it wants to on the push/pull spring as it doesn't have flats, (it's an early alloy version I think), and some threads are damaged so I can't shift it anymore. However, it does shift, but as I say only with a very slack chain.
any suggestions or advice/thoughts?