Rebuilding the hold position valve on a WD45

Thanks

Another thing to check, especially if you've tried to reseat the ball. The hold position valve has a rod that rides on a cam. As the cam turns, the rod lifts the ball off the seat allowing the rams to drop. When the cam returns to the original position the rod should allow the ball to return to its seat. If the seat has worn or the ball been re-seated (you really need to pull the rod out to do this), the rod may be too long to allow the ball to seat. Its trial and error, grind a little off the rod, put her back together and see if she holds. If not, grind a little more off the rod. You'll know when you've gone too far when she holds but won't drop (rod too short to raise the ball off the seat). :-)

Jack