METAL THROTTLE TUBE

I was shuddering too!
 
That's more than just a bit odd. Not seen a tube for 1" bars yet that was not a good 26.4mm ID.
 
So are you saying it will slide over the bar but wouldn't fit on throttle cable side?
 
The housing is the problem, here are some crappy measurements that I took at work: the first is Avon, 1.184 in is stock, ISO is 1.142in. 1.3025 is the Avon. If I get time I'll measure the biltwell.
 

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