Sorry for the delay in answering.
Im 90% sure its the bed, I tightened these,(red) it's a little better BUT now when the carriage / saddle is wound all the way up to the chuck it gets tight and the same when its would all the way down to the tail stock, so I think the bed has worn a little in the middle, the working aria, there's no play on the back runner its just the front, also if it tighten the carriage lock that improves it
Im 90% sure its the bed, I tightened these,(red) it's a little better BUT now when the carriage / saddle is wound all the way up to the chuck it gets tight and the same when its would all the way down to the tail stock, so I think the bed has worn a little in the middle, the working aria, there's no play on the back runner its just the front, also if it tighten the carriage lock that improves it