I let a friend use my Techsew 2700 to sew some projects. He accidentally let the lower thread get sucked down and I believe he engaged the safety clutch. After getting the thread out I also noticed there was a small burr on the rotary hook. I looked in the manual to see how to reset the timing, and could not understand how the thing worked. So my questions are:
1) How do I use the safety clutch to reset the timing, and how will I know if it has been reset?
2) Do I need a new rotary hook, or can I just sand out the burr.
Thanks for the help!