If you search on this forum
forums.ybw.com/index.php you will find a fair few threads about the Barton Winchers
Some people have installed them and like them but others say they are not that effective
I think that for them to be effective you have to have the sheet wrapped around the drum enough to jam the sheet against the bottom of the wincher for them to hold unlike a true self tailer where you only need 2 or 3 wraps around the drum before you put it in to the self tailer
On our boat my wife used to have trouble pulling in the headsail sheets but i told her to put 3 wraps on the winch, put the winch handle in, kneel over the winch, pull in as much sheet as she can while the headsail is coming across with no load on the sheet, and when the sail is set and she wants to trim it in further, operate the winch handle with her right arm and tail the sheet with her left (although we do have 2 speed winches so that helps)
This can be hard on the knees so a set of knee pads helps but it is much easier than trying to operate a winch from a sitting position
On mine there are cleats just behind the winch and if you put 1 turn of sheet around the cleat it will hold the sheet on the winch without slipping and you dont have to hold the sheet when you have it set where you want it
The boat i race on has 2 speed self tailers so i know that they are easier to use but i cant justify the money to replace mine so i just make do with the above procedure
A lot of the time on ours though i get my wife to helm and i trim the sails and this alleviates the problem
Regards Don