Jib Winch

Charlotte III is a Moore's boat with Tufnal winches made by Main Marine.

I am currently stripping and polishing the boat ready for the 2011 season and when I removed the winches, found that they appear to be ratchet types.  Unfortunately there are parts missing, hence they revolve both ways.

 As research indicates that  Main Marine longer exists, does anybody have details of the internal components or are prepared to strip down a "working" winch to discover the components within.