Bill - Perhaps this replacement spare tire hoist would work for what you need? Yeah, it's designed for a Ferd, but seems to fit your basic drawing design and specs. Picture is from the linked evilbay ad.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
