Hi, and thank's folks for a fast response! The assembly is now replaced, I struggled to get it back on, though - a pain in the neck job if I should say so. Especially recompressing the new coil - it may have been partly due to a lousy compression tool ("a poor workman blames his tools"). I found it also fiddly to get it back in position at the two bottom end bolts. But now it's ready for a road test.