After riveting, Screw can not pass thread.（Riveting tool）

1. Operation caused.  Perators must has a profound understanding with 
2. manual hand riveter and pneumatic hand riveter, Mastering control strength, do not greatly too forcibly,if so, the thread will get damage.
3. Hydraulic riveting gun need adjustment stroke，the stroke change all according to the plate thickness. If change too much, the thread will get damage as well.