Lewmar produced the two cockpit 42ST winches in the late 1970s. 
They provided an exploded parts/assembly diagram.
(The 42ST= Power Ratio of 42.2:1, a pull of 30 lbs of effort
on the handle will equal a line pull of 1266 lbs;  ST = Self Tailing). 

     The first picture above shows how the chrome on the drum was beginning to flake off in sharp pieces.  I wanted to re-chrome, lubricate and reinstall these winches with a proper backing plate.  I had major problems in getting the three SS Allen head screws out of the winch top plate.  Nigel Calder in his excellent book,
“Boatowner's Mechanical and Electrical Manual,” uses this same winch and screw to point out an example of dissimilar metal corrosion (page 518).  Guess he had the same problem.

     I cleaned up the gears with turpentine and lubricated them with white marine grease.  The gear pawls and springs were lightly oiled with sewing machine oil. 
 

     I had FAR-MAC PLATING in Melbourne Florida do the chroming.  It took them about four weeks and they did and excellent job . 
 

     I made the backing plate out of 1/8” aluminum and drilled oversize mounting holes.  I used a liberal coat of Marine Silicon to seal the bottom of the winch to the teak. Pictures below show a finished drum and completely reassembled winch on the port side of Mikhaya.  

Exploited Diagram of the Lewmar 42ST Winch
(Courtesy of Lewmar)

Other Lewmar Winches mounted on Mikhaya
(Courtesy of Lewmar)

Mast Mounted            #16 (2ea)   Exploited Diagram
                                                          (Off site link)
Port Deck Mounted      #8             Exploited Diagram                                                            (Off site link)