This is how I made my own Bearing retainer nuts. Got the 1/2" x 10" Acme tapered tap at Enco, drilled my tap handle to take a 1/2" dia. solid shaft of brass. Then made shaft holders and bearing holder on my old CNC mill out of PVC scraps that I have. Attached the whole mess to a junk counter top I had, clamped it in a wood vice and started tapping!! The PVC plugs were cut from a junk chunk of 1-1/4" dia. PVC rod with a hacksaw, turned and drilled on my HF lathe to size then counter sunk, drilled and milled on my HF mini mill. I think they will work just fine and the price of em was free, even tho the tap cost around 65 dollars. I plan to tap my own floating nuts for acme rod so tap will get used again!! You MUST use a tap fixture to tap these things, I tried it without and it wobbles on acme rod, just hard to get a straight tap by hand. And be sure to run tap all the way thru and out the bottom, DO NOT reverse tap to remove.