.../...very tight. I took mine out last week to see why the top right lever got stuck and the speaker was binding.../...
You need not shim the speaker.
One of the plastic heat lever wheels (top right one) has the protuding plastic milled off from factory; in order to clear the speaker.
However, on aftermarket lever wheels, this is not so when delivered/sold, and you need to cut the part yourself before installing.
We credit JoeA with the illustration!