Here is how I repaired this kind of lever: I cut 5mm off the end of a wire hanger from the closet (then put the hanger back), then heated up a pinch of polymorph plastic to 70C (with my lighter on a tin altoids lid) until it was clear, then moulded it by hand in to a ball and jammed it into the space above the damaged metal. Then at the now hot plastic filled gap I insted the bit of metal hanger. The plastic cools white, is strong and hard as nylon and the bit of hanger provides a metal wear point that is tougher than the original casting... better than new. I also reinforced the ABS bracket with the stuff since that can break too... 10 minute fix and I used <1% of my $10 bag of polymorph. (oh and I used some lighter fluid too)
I hate calling manufacturers...
I have just had an issue with the drake flush lever however the problem seems to be in the plastic part that goes thru the tank. The handle was sitting very low almost at say the 5:00 position. I lifted up on it and its back where it should be but I can't seem to be able to get it tight. Any suggestions would be appreciated