I had a Summit 19 x 60 some years ago, had a 4” spindle bore with an MT#6 spindle taper.
At the time I had Royal Products build me a 5C closer. The only really strange, custom part was the huge aft spindle adapter.
The front was a combination MT6 to MT3 or 4 and that adapted to 5C.
Worked great for anything under 3/4” diameter or so.
Currently trying to locate a similar arrangement for my MS1250 have everything except the 5C adapter for the spindle.
