Hi, Dfariswheel and vicvic,
I am confused here. The bolt sleeve lock only functions when the bolt is open and the safety is in the vertical (dismount) position.
When the bolt is in the rifle and closed, putting the safety in the on position locks the bolt handle down and the bolt cannot be opened. That is done by the safety spindle locking into a notch in the back of the bolt body. If that is not happening, there is something wrong with the safety or the bolt body, not the bolt sleeve lock.
Jim