Any suggestions for keeping the belt tightened that controls the movement of the lens carriage on the x axis? I'm not certain the specific part number or name, but it's black with teeth on the inner facing side and affixes to each side of the lens carriage with two screws.
It seems I've tightened it at least once a week for the last month... I even tried changing it... but within a week it's always flopping or sagging again.