Hello Pat,
The finger is probably not on the camstack properly, you need to take the top off the machine to check, at the very worst the camstack may be cracked and if it is then the machin e would be scrap unfortunately because the cost of repair would far moire than the machine is worth, you can adjust the camstack by undoing the screw on the bottom of the stack and noving it up or down.
Ken
ken
December 2010