Hi Paul, can you post a picture I may have a good spare amoungst my dubious treasure pile.
I've dismantled and repaired many years ago. A big spring files out and it's very difficult to reassemble. The fault appeared to be dry grease on the spring. Cleaning and very light lubricant worked.
Can't say I will do it again because of the risk of making an error and the system not working when I need it most, wouldn't want to find out the hard way. I have subsequently used 240 with the clip replaced, but I am not sure of anyone willing to sew belts anymore because of the legal liability risk.
For a long time someone on ebay UK was selling nice replacement belts made for old Volvo models.