Falls off to the outside or the side away from the spindle aka in the direction of the AS force? If so, then maybe you can glue a stopper to that side of the lifter arm. Or just dump the lifter. It does not damage the stylus to ride for a few extra seconds in the runout grooves.
Audio technica AT6006R tonearm lifter
I've been using one of these for a few years on my garrard 301/sorane sa1.2 and it's been great.
Recently I tried to set one up on a friend's rega RP10. It was quite tricky to place because of the hole in the plinth in the ideal position, but managed to get it working OK eventually.
The big problem is when the lifter activates, the antiskate force pulls the arm off the lifter and it falls off back onto the record, with the associated awful noise and wincing.
Any bright ideas on how to fix? I've checked the anti skate and it's set to about 1.5 on the scale. It really needs something to increase friction on the underside of the arm. Maybe some rubberized tape or Blu tack?
Any ideas most appreciated.