I Need An Opinion Or Three

you want Ruland branded, I paid like $25 each for mine, go to there site and find a local distributor
I spoke with a Ruland rep, HAAS uses a rigid coupler made by Ruland, they are US made parts

I just looked up a half inch shaft coupling, 40 bucks, mine were cheaper as I had 1/4in shafts

one last edit, personally I would use US parts, better manufacturing tolerance, ZERO backlash, plus you can always get replacement discs
 
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i looked up the oldham couplings, they must be gold plated, based on the prices. maybe i read it wrong but looked to me near $100 each. whew !
who makes or supplies the double diaphram ones ?

I bought my double diaphragm couplings on eBay. IIRC about $25 each with free shipping. EBay should have Oldham couplings for a reasonable price.

Tom S
 
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