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Thread Pitch

model80
in Bultaco

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One brilliant side effect of this Social Isolation is that I have plenty of garage time to finally get dug into my 199B restoration.

I notice this evening when attempting to fit the rear shocks that one of the threaded dowls to hold the Shocks to the Swinging arm has been powder Coated inside and has clogged the threads.

What size tap must I use to redress the threads. Is it Metric or Metric Fine?

Here a link of the type of screws and washers I’ll be using. 

https://www.inmotiontrials.com/product/rear-shock-fixing-kit-silver/

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