I use a drill motor for my lathe. I put a sewing machine foot peddle on it so I could have hands free operation with speed control.
I bought pullies from McMaster-Carr, some are available at the large hardware stores in the sliding glass door section. Finding o-rings to fit the pullies was the hardest part.
I made my roller frames out of 2" angle aluminum and some barstock. I have enough for both finnishing and dirty cork lathe work.
My drying motor is a 12vdc gear reduction motor powered by an adjustible ac to dc adapter which also gives my speed and direction control.
Anyways, big hands require bigger grips, which can not be bought. Same pretty much goes for afordable good natural cork.