Ok. Post chardonnay I think it's clear in my tiny mind now. I've ordered a press similar to the one above and I've ordered some single sided razor blades. I was about to order the WSO retaining ring (£70) when I had a thought, what if the retaining ring is already a WSO one? I don't know, I've only just bought the watch. So, I've asked the seller if he knows what retaining ring is on the watch already, no point spending readies on a part that turns out not to solve the problem see?