Oh, wait, no, it not working. I could remove Crushers from base, but if place in cobble mode again - still crashes.
This is a bug in the latest edition of Flaxbeard, should be fixed in the next update according to https://github.com/Flaxbeard/Flaxbeards-Steam-Power/issues/200. I just downgraded to the version in the 1.2.2 pack for now, works fine there.