Hi guys. I got today my 1st ST300 and the plier head is too much stiff IMHO. With the tool opened if I try to open the plier's Jaws the handle close itself! I oiled it a lot and also I tried to heat up the plier head to 500C with an industrial blower but nothing. Is still very stiff. I cut some washer with the cutter but the situation is the same. any ideas?