Emily,
Thanks for your suggestions. Will need a closer look at the products you suggest but I hopeful that I can find a solution among what you offer.
BTW, the link attached to one of the product photos --
39-336 -- (https://www.swisco.com/Universal-Joint-With-Pole-Ring/pd/Replacement-Window-Operator-Accessories/
39-336) goes to a page that shows individual parts that make up a whole unit that looks very similar to what I'm trying to replace.