Outer Foot No.2 - Bolt locking issues

This afternoon I removed the internal motor frame from the shell, with the intention of stripping it apart to carrying out the weight reduction process as for frame no.1, only to find it wouldn't come apart? On looking inside I found one of the motor bolts had come loose! I managed to get the internal frame out and found that the other two bolts were loose.these do have barbed locking washers, but I think I may have to apply some loctite thread lock!