@LeilaMay , you are right, tbh, I wish I'd left her in her box. I haven't done anything different but put plenty of oil on things, strip the bobbin area, and give it a good cleaning. I've obviously disturbed something, as I can't get the shaft to do a full turn, to tighten the second screw...
@Lace , yes I joined the FW group, and had a FB discussion with a lovely chap who seemed very knowledgeable - unfortunately , he's Canadian, so a bit too far to send my machine...
I feel a bit embarrassed to raise the same issue again, when no-one seemed able to help - especially as I seem to have made matters worse...
As LeilaMay says, I think it may be time to re-construct the FW so that all the bits are together if not working, and put her in her box again, until I feel able to send her away...
My problem I think, is that the FW looks like very simple engineering, and I've been a bit Gung Ho. I didn't reckon on things being so finely balanced that I may have disturbed something. YouTube has a lot to answer for!
Jessie