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Spec change timings - BSA M20

Hi folks

Some rivet counter assistance please - can anyone identify when the following changes took place in production

It has a bearing on my new project & final spec to build to

1/ when were rubber mounted handlebars replaced by the more commonly found solid type
2/ when were rubber mounted footrests replaced by the checker plate style metal foot rests
3/ when was the front brake rod replaced by a normal cable
4/ when was the speedo drive on the brake plate moved to the near side (left) of the front wheel
5/ when was the 8" headlight replaced by the 6 1/2" headlight

I have a good idea of when many of these changes took place - but am hoping someone nay have frame or contract details of a more or precise timing of change in production. It seems from what I can make out, most of these took place over time and were not implemented in one hit

If anyone can help, I'd be very grateful to hear from you

Best regards

John

email (option): Jonnyob1@googlemail.com

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