Thank you everyone! I believe I literally said to my dad a week ago "oh yea, I'm never actually going to find a booster, are you kidding me?" haha, i stand corrected, this was a complete accident. I was looking for custom vintage flash hiders to put on a side-arm blaster I'm working on. I noticed a little listing that said "browning 303 fh" and I was like........uh....and decided to click on it. <br>
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Of the correct vintage kind of sink knob - The black dome endcap versions have a taller socket, (a solid cylinder) not the sunken in models that were used on the saber. This means I have much less space for the head of a bolt. <br>
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I know of the idea of drilling and tapping T nuts to the central spacer, and I also know of the idea of using an FX spacer, both of which will cost me a bit of dough and some precise drilling without a drill press. Once I get this and see if it has a bearing, I'll weigh my options of bolting this together.