Hi guys, Im having trouble taking the front screw out of the tank. Taking the front bolt out is taking more effort than i thought. I start undoing the nut and it goes fine for about 1cm but then after that it just locks up... and wont go any further. The thread is fine on the bolt - but i wont come. I was thinking maybe it has a slight bend in the bolt? But it doesnt really look like it... Anyone got any ideas?