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- Nov 25, 2015
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So I would leave .25 to .26 unthreaded. If you pass the .26 it will still use that last remaining thread and you'll be fine. I just wouldn't go past .25... each turn of a 8tpi thread is .125 so you have from .263 - .125 to err. Remember the goal is to seat the backplate on the stop. So even if you leave .260 unthreaded you are probably good. And if you don't like it you can take off more later.Just a hair over 1/4" is unthreaded is all.
5 full turns is the most I can get screwing the plate on backwards and there is only .3230"
or so left unthreaded yet out of .5300" of remaining hub left.
So, .207" more and I will be into the threaded portion, reducing the total overall thickness a lot!
It's at 1.35" now.