@Ashley A I think you may be right. I removed the positive pin some time ago to inspect the tip for black marks. I only tightened the nipple by hand as I was scared of damaging it. Having watched the video that @Andre posted above, I saw the person tightening the nipple with pliers. I did that last night an so far so good.
@johan and @Alex how did you remove the paint under the spring. I would guess a Dremel type gedoente?
@johan and @Alex how did you remove the paint under the spring. I would guess a Dremel type gedoente?