Hi, thanks for your posts. The rollers can't be adjusted I don't think as the bottom position is set in the casting. They then have approx 10mm movement up looking at the photos attached. This resistance of this movement is what can be adjusted via the springs. I'll be in a position to try the machine out soon and I'll keep monitoring it for differences in the finish and adjust accordingly.While I think about it, the springs are unlikely to have lost too much of their mojo, they aren't working too hard. The important thing is that they are all evenly springy as it were. If you are in any doubt then a good way to check is to pick one spring as a reference. Now place it end to end with one of the others and put them in a vice. Compress the pair gently and hopefully both will compress equally. Repeat this with each in turn. If any compress noticeably more than the reference one then you will have to replace the set in all probability. Your chances of finding an individual replacement that is the same as the others is pretty slim.
Thanks, Rob.