http://www.boats4sale.co.nz/wincher.htm

Molded rubber Wincher slips over the top flange of any nontailing
winch, giving you the benefits of a self-tailing winch for a lot less
money

Special ribs on the underside grip the top turn, allowing the tail to
peel away after drum rotation

When winched home, the tail can be tucked into the ribbed groove
between top and bottom flanges, keeping friction secure on the drum

http://www.boatbanter.com/showthread.php?t=9509
Click here to visit a forum that discusses
"The Wincher" as a topic

http://cruisersforum.com/showthread.... threadid=2633
Self Tailing Winches
XXXXXXXXX

I wondered if a reg. winch could be retrofitted to a self tailing
version. So the above is the info. I have found

Mic - sailing in 1967