Two questions: First - how do you know what model Daysailer you have - as to II or III? The tag on the transon says that it is a 25th anniversary edition - making it at least a 1984. I don't believe that I can rely on the mainsail number since it may be a 2nd or 3rd edition. What else establishes whether it's a II or III?My second question pertains to the masthead sheaves. Both sheaves are jammed (---corroded or expanded) in place and, for some time now the mainsheet halyard has simply pulled across the sheaves - making the contact points quite shiny! The pins holding the sheaves are original, and peaned in place, but their removal would not be difficult. Where can I get replacement sheaves of the correct size that I could simply hold in place with a thru bolt and nut?