Replaced the head on my sister's JA on the weekend, and after cleaning bits and pieces, put it all back together. It ran fine, but for some reason kept leaking water slowly, but not all the time. Tracked it down to the overflow bottle, then spent half an hour trying to figure out why it was running over the outside of the bottle from the lid, instead of in.
Turns out I put the overflow cap back on the wrong way round
Anyone else do things like this all the time?
