A locking piece fitter of a pistol type wherein a guide needle is inserted and fitted in the tip, a push-in rod is contained, a supporting base having a supporting groove and push-in rod guiding hole coaxially aligned with the guide needle and push-in rod is arranged between the guide needle and push-in...http://www.google.de/patents/US4402446?utm_source=gb-gplus-sharePatent US4402446 - Tag-pin attaching apparatus
