I was trying to use a homemade press to get the bushing all the way in. I have a M14-1.5x120 bolt running through a stack of washers and a metal cup (oil filter wrench). Unfortunately the cup pushed on the "wings" of the bushing, not the sides near the bolt, so it didn't work. Since the M14 bolt has a shaft that is smaller than the factory bolt, it shouldn't be seized on the bushing.

The bolt came out enough that the cup and washers are loose with the subframe being supported by a jack, but that's all the farther it's come.

I think the threaded rod would have been the better way to go as you are putting less strain on the factory threads in the welded in mount. Where did you find a metric threaded rod?

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Tim Irwin
1983 300D
1994 Miata R Package
unnamed family car