I am warping my new-to-me Baby Mac, and I am using the lower warp beam, with a friction brake. I can't get the brake cable to release the drum in order to advance the warp. If I adjust the turnbucle all the way out, I can get it to turn a little, but I can hear the drum grating against the cable, which probably means that the cable is scoring the drum. Does anyone have any tips for getting this to work? Most of the posts about brake issues that I have seen are about trying to maintain good tension, but this is the opposite.