I got the stuff I needed to rebuild the reproducer this morning.
The tube gasket I have for my Aeolian Vocalaion reproducers is the same as that for a Victor Exhibition. It is a bit too small for the Bestone Celebrity soundbox. So I ordered a thicker tubing that is used with a Columbia reproducer; it is almost too big, but it worked.
With my AV rebuilds, I started ordering more than what I needed because of my initial uncertainty and my wanting to have fall back spares. I have continued this practice, and a good thing it is, too! I ordered double what I needed for the Bestone. I got short changed on the tubing. I got one sort of OK diaphragm, better than the original, and one train wreck with lots of places with separating mica. Both had very poorly drilled centre holes.
Hmmm. The mica I got for my AV rebuilds was very good and the tubing was cut generously. Same source. I will raise the issue with them.
Anyway ... I redid the soundbox. It was a bit challenging, but it came out OK. It passes the blow test--no air leaks.
I temporarily used the old back flange flat gasket. I made a new tube gasket for the retainer--I had to use the Exhibition size tubing--the Columbia size was way too big. I don't think the retainer was intended to be absolutely tight to the back plate. Mine originally appeared to have a bit of bees wax applied to it where it meets the back plate. I will probably add some wax later. There are some other things I need to adjust, too.
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I reassembled the tone arm, lubricating it with a bit of synthetic grease. I installed the sound box using the original gasket, and then I took it all to my AV machine, I found a spot where I could hold down the base of the tone arm with my thumb and where the arm had a good radius arc across a 12" record. I wound the machine up and played a repaired Beniamino Gigli record using a medium tone needle. The reproducer and arm "with no horn" are
really, really loud, and they sound quite good. It is a pity the reproducer will not fit on any of my other machines. It would be nice to hear it with a horn. But that will have to wait.