Problem with L reproducer on Opera

[marcapra]

I just got an L reproducer for my Opera phonograph. I'm having a problem with the lifter mechanism for the weight on the reproducer. The lifter works fine when I use my Diamond A reproducer. But when I put on my new L reproducer, when I lower the lifter to play a green Amberol, the lever won't go down all the way. When I push the lever down with my finger, then it connects with the cylinder, but about half way through, it starts lifting away from the surface again. the only way I can play the whole record is by holding the lever down with my finger. Any fixes or ideas? Thanks, Marc.