jonsereds 451e recoil spring

[scotclayshooter]

Hi snapped the recoil spring in my jonsereds 451e today for the forth time now its too short to heat and bend for re-use i visited the local dealer today they tell me its no longer listed. did a search on AS seems they are in short supply. has anyone sussed out a suitable replacement yet?
the original part no was 504 21 00-17
the 451e was my first saw i would like to keep it running
Cheers