I inherited a Craftex CT089 lathe and am learning how to use it. Watched videos on threading, but am having difficulty cutting a thread. I have a 3/4" blank installed and both slides zeroed. The gears are set for 11 TPI which is what I want. The compound is at 30 degrees and I am only advancing that slide. The half nuts are engaged and I advance a few thousands and cut towards the chuck. This first pass looks perfect. Keeping the half nut engaged all the time, back out the cross slide and reverse to the start for another pass. Few more thousands and begin to cut. New cut is definitely not synchronized with the first one. Repeated cuts do not find an average, or a defined thread, rather, there is a really rough looking piece of round stock! Thinking the problem was the lash in the carriage attaching to the leadscrew, before making a pass, I began advancing a half inch or so before the cut would start, which should take care of that? Anyway, I am out of ideas here. Hoping for some direction here.