HST neutral spring hitting Drive shaft

[Jamesm2888]

Hi 83 B6200, HST 4wd, had to fit a new kubota spec Neutral HST spring, after old one disappeared into ether, its now hitting the driveshaft coupling as it rotates, ive fitted and refitted it, eye of spring in and out, no change, what can I do, space is insanely tight between the coupling and casing of box, one side of coupling hits spring on rotation when moving