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Fitting new isolastics

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Hi, I am building a Feb 1969 Norton Fastback, 3/4 finished but I have run into trouble fitting the new rear RGM isolastics. I can't work out if the early Commando isolastic bore is smaller than later models or if I am being stupid. The bore is 3.1/2cm the rubber is 4cm. The instructions say - use your thumb to press in the rubbers, but it's impossible! Has anyone done this before? Any help appreciated! Thanks.

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Hi Wayne,

I have just fitted new isolastic rubber to my 1972 model, the bore is 36mm approx. The spare cradle that I have is the same (36mm). The rubbers did go in easily. Sorry it`s not much help to you.

What do RGM say?

Regards, Gerry.

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Thanks Gerry,I think my Cradle is 1968 and Bore 34mm and thats why im having trouble fitting new rubber, Thnks for the halp at least now i know the problem.Chears.

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Dear Wayne,

Some of the early isolastic bushes had an outer metal sleeve, this may still be in there if you have only removed rubber part + inner. Have a close look how many layers of metal at the end of the tube? feel with your finger does diameter enlarge inside after first inch. I came across these on my early fastback -sods to remove- if you find this outer ring you can carefully cut through it with a hacksaw blade to release it then drift it out.

good luck martin

 


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