I recently inherited an old Bosch drill from my father (CSB 470-RLE). It must be at least 20 years old. I intend to use it to put up some hanging shelves, curtain rods, etc. It seems to be a impact drill as there is a switch on the top with a hammer icon. When I plugged it in to test, the drill spinned but I did not see any hammering action at the drill bit. Is it that the hammering will only happen after I drill into the wall? Or should I be able to see the hammering action even without drilling into the wall? I don't want to put a hole into my wall only to realize the drill is spoilt and cannot complete the drilling.