My Armstrong trolley jack (Model M901) has stopped jacking
I can get it to raise if I pump vigorously but any weight on it and it will descend. With no weight on it, it very slowly descends too. The sticker on the front is hardly legible and I seem to recall seeing an exploded diagram of one several years ago.
Anyone got something they can scan and email me or point me at a website. I suspect it's just a seal or something but I've never played around with the workings of it before.