I was able to track down Hi Standard. They are made in Houston now. Spoke with them about this problem and also needed a slide stop spring. This pistol does have a floating firing pin. No spring. After cleaning it worked fine.
Slide stop spring will be from one of their parts suppliers: G W Elliott Co in West Hartfort, CT as the minimum order from the factory is $20. Spring + S&H is $7.50. Sure small and I will consider a little epoxy to keep it in.
I'm looking forward to shooting this as I believe these old guns were well made.
Now, if I could just find a couple of magazines at a reasonable price.........
Dr. Sam