To all that have replied-thanks! The various responses have not all appeared on this thread, perhaps because some of the responders have chosen to send me private email instead of replying to the forum.
Yup, the windlass on my 78 Tolly 48 is a Plath #9. Thanks to all that pointed me that way. I've yet to contact the company for more info, as most of what I needed are on their website.
Thanks again,
Pete