It works really well on flanged bolts and nuts, or allen heads and similar. On ordinary bolts you need to put some steel of suitable length inside the socket so that the force from the blow is transferred directly to the fastener, not the surrounding material. The beauty of this tool is that the...
The shims can be considered permanent in the sense that removing them would be pointless, but their only purpose is adjustment. Proper grout is much better suited for load bearing, although shims may be sufficient for small loads. I'm about to grout for a movable lift myself, but don't plan on...