Thanks MIke, patience Grasshopper! 

George,
you are spot on with choosing a replacement. I'm out of the loop as to what's what, but recall maybe 5 years ago about a test between all the cordless routers.

I wish I could change out the discs, the original backer is aluminum and to get it off, assuming I had another with a different grit to swap, I have to remove the table and lift the head with the disc and 48" belt sander off of the base to access the hub screw.
Only thing I think that would work is to cover the disc with the hook fabric for a H&L conversion from the PSA.

Then I'd just need to drop the table to change grits. 

Thanks Ross!
The spindle lock on mine sheared off after the first few years so I have to double-wrench it to change bits.
Bingo on the clunky height knob, also the lock lever for the fixed base is either too loos to lock or too tight to release the motor. Basically I need to give it a half turn after unlatching to free up the motor.

The plunge base fits the motor perfectly