ISO part for Bernina 530 Record
 

I got an lovely Bernina 530-2 Record at Goodwill. I'm looking for a replacement zigzag control knob - a round knob with a vertical white line through it. Finding parts for these vintage machines is really a long shot, but if anyone knows of a source for this knob - or if you have the knob I'm looking for from a machine that can be scavenged for parts - I'd appreciate a reply.
Thanks!

Keep your eye on ebay. Lots of parts machines and parts come up for sale.

Thanks Candace. I have a saved search on eBay for 530 parts and every once in a while something comes up. I think I will have a long search and it will be a stroke of luck to find what I want. It's a challenge!