You need to use some judgement with a rattle gun Polybus, but it isn't anything complicated. Just remember a few simple points:
- if it is pneumatic, oil the rattle gun before you start;
- oil the accessible part of the thread before you start;
- be careful to set the rattle gun's direction of rotation for forward (tighten) or reverse (loosen) before you start, rather than leave it on whatever it is set for and just go for it;
- set the torque control at a level that is not capable of damaging the parts;
- do not try to use a large rattle gun for small jobs - it is both too clumsy physically, and insufficiently sensitive in torque control;
- never try to start a nut on a thread with a rattle gun - you'll cross-thread it fairly often.
Those six points all sound obvious, but unless you deliberately form work habits, sooner or later you'll forget one or more of them. There is also a temptation to misuse a rattle gun for assembly work. You must have the parts properly assembled and bedded into place before you apply the gun: it is a blunt instrument, unlike your hand, and it won't notice if, for example, a dowel hasn't entered its socket. The results of misassembly will be quite ugly.
