You will need to cutoff the threaded area on both ends of
the shaft using a hacksaw where the threads start. Then you
can order two tapered shafts adapters, one right hand and one
left hand making sure the i.d. of the adapters match the o.d. of
I converted a home depot grinder into a buffer. In case I wanted
to also use it as it was intended, I made an adapter instead of
removing the threads . The adapter was made from a piece of mild
steel 5" long and .75" dia. One end was drilled and reamed .500
dia deep enough to slide over the threads and two holes were
drilled and tapped for set screws. The other end was turned to
.500 dia long enough to accept the tapered shaft and a flat was
milled on it to provide a seat for the set screws.
I also made a piece that was 5" long with a .500 dia thru hole.
Four holes were drilled and tapped for set screws. I use this
adapter to hold a small Jacob’s chuck that has a .500 straight
shank. this works great for flex shaft tools when it is easier to
work than the tool. all I need to do now is encase the unit in
sheet metal with a duct for a shop vac.