Ethel, I usually remove the needle and put the needle bar down on a wood block, then hold the handwheel with one hand and use a pair of Channelock Adjustable pliers that I’ve lined the jaws with leather with the other hand.
If that doesn’t work the first time, I get my 24-inch Rigid Pipe Wrench out and lay it on the work bench. Then I try the Channelocks again, and so far, they’ve always came loose.
CD in Oklahoma