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parts needed

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any idea who may do parts for 1979 montesa 247, i am in need of a chain tension spring, 

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it has about 4/5 turns , straight then bend at one end and straight at the other, i see the full tensioner and spring for about £40 for sale but the tensioner is in good condition so i was after the spring only

I picked up a suitable spring for my 247 tensioner at an old-school ironmongers. A few bike shops of this type also still exist - you know, the type where they don't deal in part numbers but have an old glass jar behind the counter with a yellowing hand written label marked "springs'.

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