Originally Posted by NapaJohn

You can squirt a little liquid wrench on that screw, let it sit for a while, and then try it. You're lucky in getting that type of handwheel. Mine has a circlip fastener (no screws) that is awful to both get off and back on...easily lost when it sproings loose. You can join the yahoo group "elnaheirloomsewingmachines" and then go to the files section and download the service manual for the "Star Series." There are also some instructions on the foot controllers. That should help. I will also caution you that if you remove the bobbin case there is a tiny spring that reportedly springs out and is easily lost. I've been hesitant to take that apart for that reason but mine is sewing fine. I did see a CL add for one for a "bargain price" of $150 because they took the bobbin assembly out and couldn't get it back together.

You got a great deal.

If you're unsure, it wouldn't be a bad idea to get it serviced and the service guy would replace that screw and know what to check. You could also try oiling it first and see if it improves.

A good source for parts (and information) is http://www.whitesewingcenter.com/index.php
Ray White also teaches sewing repair workshops in various locations and is reportedly very good.

Good luck and enjoy your new machine.