I originally filled both of my mounts with 94a. I removed them so I can carve out the factory rubber (+ 94a) so I can fill it completely with 94a. I perferated the now solid rubber with a drill, then grabbed each perferated section with needlenose, then pliers. It was a major PITA, as the 94a bound to the mount housing. And when drilling, I knew when I was drilling through the rubber or the urethane... big difference! After I removed enough material to remove the rubber+shaft assembly, I used a hacksaw to cut big chunks out. After I got in close to the shaft core, I used a combo of dremel and file. Major pain... If I had air tools, it probably would have been faster. Now I really wish I just took the time initially, and gutted it instead of just filling it.
Oh, contrary to what some people have said here about filling the rear mount... it was absolutely solid -- no gaps or air pockets ANYWHERE!
I'm now beginning to not want to gut and completely fill the front restrictor. Is the solid front vs filled front as beneficial as the solid rear vs filled rear?
