Seem to be making a few mistakes with my CLX just lately. Last week I broke the brush socket

Today I was doing a first clean, scrubbing the upstairs windows and all of a sudden the clamp for the angle of the brush came undone and the brush wacked against the window. This was a genuine mistake and I thought the bolt was tightened. Luckily no damage was done

Anyway, how often do you finger tighten the bolts? Has this happened to anyone else?!