I picked up a Golld Tone top tension to try out at an acoustic music store (OB12?) and was surprised at the tone and quality.
Price seemed a little high to me.
Maybe they would have flange parts soon? Is there a standard inside diameter? I had to buy 3 two piece flange sets before I could fiit a Leo Fender pot I had laying around.

Yeah… that’s really my biggest concern. If a replacement flange cracks one day in the future, I guess that’s life.

I guess I’m really just hoping I won’t have to run through a gauntlet of failed fitments before finding a flange that works without major modification. I can measure the rim diameter (though perhaps not with the accuracy needed to ensure a perfect fit?) Can anyone think of additional things to measure/verify before committing to a particular replacement TT flange?

Just my opinion, but...

... if you have trouble finding a replacement (or you get a replacement that won't fit the rim), perhaps you could get a regular flange and then drill and tap it to fit the bolts you have. I'm taking A GUESS that the bolt holes on a TT "line up the same" as do the holes for a "regular" tension hoop/hook arrangement (I welcome correction if this is wrong). If I were to have this done, I'd ask the shop if they could set up the flange with "Heli-Coils" instead of tapping the pot metal -- would prevent the problem of the bolts "stripping the pot metal", which seems to have been a common problem (and fix) for TT's through the years.

Greg Boyd shows the Prucha TT flange as "out of stock". Wondering how much it's going to cost when it comes back into stock...

You might try Eric Sullivan, Tim Davis or perhaps even Steve Huber.

Or...
... you could get a regular flange, tension hoop and hooks/nuts, and "convert it" to a standard pot assembly. Over the years, I've come to the conclusion that TT's, even though they look snazzy, are just too heavy and represent a solution that is no longer looking for the original problem (plastic heads took care of that). But again, my opinion only.

It is surprisingly easy to tap a regular flange for top tension use - the same thing Gibson did with the originals. If this were my banjo (it looks like a great one!), I would use some JB weld on the flange underside and not worry too much about it. Prucha is using pot metal - only Great Lakes (to my knowledge) was producing top tension banjos with brass flanges. Well, early Stellings...but not many top tensions produced.

I recall reading a post someone put up here a while back, that said classic auto restoration shops can do very good repairs on pot metal. If there's a shop near you, might be worth a call or visit...

Thanks guys — appreciate the advice! I think for now at least, I’ll look into keeping this flange alive a bit longer — either with a professional repair (if reasonably priced) or a little bit of the ol’ JB Weld.

For now I’ve just been running it without the armrest, so as not to aggravate the break. The TT stretcher band seems to be a bit more comfortable against the wrist than a standard flathead…