Roy Lewallen wrote in message ...
....
I don't have a Bristol wrench for comparison any more, but I recall
their cross sectional shape as resembling modern Torx drivers.
....
:-) Yep, indeed. In fact, my older daughter bought a new faceplate
for my younger daughter's cell phone as a present, only it turned out
to be a whole new case (clear plastic). Yours Truly got to replace
the case, which was held in with #6 Torx. I was happy to find that
one of the Bristol spline wrenches from an old GC set fit just fine,
as my Torx drivers go down only to #8 here at home. So you MAY find
that a #6 or #8 or #10 Torx will work in your BC221. Mebbe I'll go
try it on my LM (Navy equivalent of the BC221) and report back.

Cheers,
Tom