[nickmerc]

My topping lift is a light wire with a thimble at both ends like Jim mentioned. At the masthead there is a small clevis pin for the topping lift. My masthead is not the production version, a PO had a custom one made, but I think it will attach similarly. Instead of spending $400 for the yard to do it, I would invest in a a good bosun's chair or a new tool that you need since you already have a bosuns chair.