Rotary construction snag..

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Original poster: "david baehr" <dfb25@xxxxxxxxxxx>

Im workin on making a Rotary gap from hardware  I have on hand 
allready, like parts fom a bycycle trainer that doest get used 
anymore.  It has a nice 4.5" dia. , .75"  thick aluminum flywheel 
mounted on a .394" shaft with nice bearings , runs very smooth and 
true. I was planning on eight threaded holes to be machined on the 
perifery ( ? ) , so bolts with locknuts should all but eliminate 
anything flying apart. ...Now, I have a motor with a 3/8" shaft 
(.375") , and the problem is getting these two hooked up and keeping 
them insulated electricaly.  I bought a motor shaft coupler from Mc 
master//carr , (rubber insulated ) , but tested it on a neon trans. 
and it arced right over.  I did play with just a peice of rubber 
hose, which seemed to work mechanically, but was allso conductive. I 
was trying to avoid belts & pulleys. I guess anything black is out of 
the question. was also tryin to keep the coupling somewhat flexable , 
but may have to go with something ridged, like LDPE , or, just scrap 
the whole idea,......ANY THOUGHTS OR SUGGESTIONS ?? Thanks,dave