300D engine mount blues

[acy76]

Hello all -- recently purchased a 1982 300D turbo, and have been reading through the archives here to exorcise the demons that plague it. Good site, and a much more mature crowd than on the other auto forums I read...

On to business: I am replacing both engine mounts and have hit a snag. The 8mm allen bolt on the pass. side mount (the one accessed through the hole underneath the car) has rounded out. I've tried tapping a 12pt, 15mm socket on to turn it out, but am having little luck.

I am thinking I could pull the entire mount leg off the block and remove it w/ the rubber mount attached, if I can raise the engine far enough. Maybe I can saw part of the mount off to gain clearance? The problem is that I can't seem to pull the mount leg off the block studs due to the rubber mount hitting the frame.

Any ideas as to how to remove this thing? I am about ready to cut the leg in half and get a new (used) one...

Thanks for any input/support.