Karma's primaries are the standard Barient 25s. I solo sail quite and have been looking to upgrade to self-tailing winches. I've acquired a pair of Lemar 40 STs. Upon comparison the Barient's drum size is visibly larger (11 1/2" vs 9 1/2"); however the Lewmar application chart indicates that the 40's are appropriate for 33-35 ft boat and sail area of 470 sq ft. Karma a 34 O'Day which sports a Genoa of 450 sq. ft. , kinda on the edge of the specs however I'm not an avid racer so I'm not too worried. Also, it turns out that they are Lewmar Wavegrip 40 (circa 1983-1991) so parts may be an issue, but I digress.
While the hole patterns are similar, the Barient's base is 6 1/2" with 3/8" machine screws and the Lewmar's base is 5 1/2" with 1/4, so naturally to cover the old holes I'm going to have to install a winch pad (WhiteCap 60468) which is 1 1/4" thick. Searching for 4" SS 316 machine screws was a challenge and I had to settle for 1/4 X 20 screws instead of a fine thread screw.
Realizing that the primaries can take a heavy load, I'm mildly concerned about the difference in the strength of the installation using smaller fasteners coupled with elevating them 1 1/4" higher than the Barients. The original backing was simply washers, which I'm beefing up.
While the hole patterns are similar, the Barient's base is 6 1/2" with 3/8" machine screws and the Lewmar's base is 5 1/2" with 1/4, so naturally to cover the old holes I'm going to have to install a winch pad (WhiteCap 60468) which is 1 1/4" thick. Searching for 4" SS 316 machine screws was a challenge and I had to settle for 1/4 X 20 screws instead of a fine thread screw.
Realizing that the primaries can take a heavy load, I'm mildly concerned about the difference in the strength of the installation using smaller fasteners coupled with elevating them 1 1/4" higher than the Barients. The original backing was simply washers, which I'm beefing up.