I took a field trip to the hardware store today to see what in blazes I could use to fabricate a flange or jamb nut for my 178mm Aero Ektar. One of the guys suggested a toilet tank to bowl washer from the plumbing department and----it works great! If you have an approx. 3" dia flangeless barrel lens you want to fit onto a lensboard check this out:
thriftco part # 525-T
It is a thick tapered rubber washer that holds even the behemoth nuclear fired A-E tightly to the graphic "C" board (a slight trim is needed to clear the light trap on each side on the lensboard--about a 16th on an inch---easily accomplished with an exacto knife.)
Cheers!
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