I've never tried it
and I don't think i would try without a drill press!
My thought in making a rammer was to put a golfball on the end (It IS the perfect size & shape)
I'm still stumped for a worm , but the swiss cheese between my ears is a-workin' on it!
I found some decorative wooden table legs that MIGHT work, but I forgot my Calipers!
I think the diameter is just about right! They have a stud in the end but one could remove it on one, and use it to mount a worm on the other.
Sand 'em smooth, Stain "em dark, give 'em some gloss urethane and they would be good lookin too!
Dave