Blaster Start / Stop / Kill switch trouble

This has probably been discussed before, but i seem to have some trouble with my Start / Stop / Kill switch on my B1.
Last Season my the kill switch would stop working (the engine would not stop when the lanyard was pulled) i then pulled it apart, and stretched the spring a little bit so that it would push the kill switch a little better. Also cleaned the whole thing with contact cleaner. That seemed to do the trick.

However yesterday, i put the blaster in the water for the first time of this season, and the trouble is now back again.

Any idea for a permanent fix of this problem? I think the trouble is with the little plastic thingy that pushes down on the rubber button inside the switch. It seems to get stuck and not push down properly.
 
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