Thanks Heaps, the flipper rotates when you press the button, when held in the flipper will not stay in the rotated position, has no strength to it. So when you hit a ball with it, the ballcan push the flipper backwards. Hope this makes sense!

Is the flipper pawl tight enough on the flipper shaft?

Lift the playfield to vertical and activate and hold the right hand side flipper with the flipper button - now with your right hand try and push down the upper right hand side flipper bat and watch underneath the playfield. Is the metal flipper shaft turning on its own or is the entire assembly moving?