Got the pin moving with a pin punch, however, after about 5mm it went solid again, and after many goes at straightening out pin punch and trying to drive the clip out, the shaft broke. Have tried getting vice grips on the back to pull but no go, then I tried filing a sort of access way in the trailing arm - looked good so I cut the end off an allen key and put it in, seemed ok, gave it a few smacks - no movement of the pin, but the allen key is now firmly wedged in the hole, and has resisted all attempts to remove it so far

Wishing I had just put up with the hard ride now.....
