I have a seldom-used, installed-last-year, hansgrohe metro single-lever kitchen faucet model 06566000. It's started to drip. The drip stops when the lever-handle is turned all the way to the right. The drip starts (and increases) as the lever is turned to the left. The TOH repair article says "worn valve-stem assembly"; given how practically-virgin this faucet is, might the solution just be a matter of tightening something, and of finding a nimble under-sink volunteer?