bicycle wheel truing gauge clamp

This is to measure the warp in a bicycle wheel (rim) so you can tighten up the spokes and make it true again (don't forget to pay attention to roundness as well - make small adjustments working around the wheel until it looks good - the nipple is like a nut and the end of the spoke is threaded into the nipple so looking from the outside of the rim it's lefty loosy righty tighty - you want to straighten mostly by tightening as spokes tend to stretch over time - but don't over tighten - if you hav