Sapim's nipple clamping screwdriver is an easy to use tool that assists in placing nipples in to deep section rims. Unique spring design holds the nipple through the spoke thread hole. Place the nipple on the spring, then insert in to the rim's spoke hole until the nipple extends beyond the rim. Grab the nipple with your fingers and remove tool. Insert a nipple driver, insert spoke into nipple and turn to engage nipple on the spoke.