One simple way to do this is to use a bicycle sprocket and a length of drive 
chain to engage or disengage it. There are more elegant or elaborate methods, 
but the sprocket thing does work.

WinchDoc
> All;
> 
>     Curious about trying to convert my FLS equipped winch into something more 
> like an F3B-type winch, wherein the drum is driven by the motor, but prevented 
> from paying out line under tension.  It seems that most of the dedicated F3B 
> winches employ some sort of sprag clutch or one-way bearing which can be 
> disengaged so that line can be pulled off the drum for the next launch.
> 
>     Having never had the opportunity to tear into one, can someone lend some 
> insight into how these are engineered, and what hardware is used?  My FLS-based 
> winch has an F3B style drum on it (not the traditional AMA-style drum) which is 
> supported at both ends.  The drum itself has a shaft which extends from the far 
> end, and is supported by a bearing; this may provide me the opportunity to 
> replace the existing bearing with a one-way bearing if I can develop an 
> understanding of how they are installed, and how they can be overidden.
> 
> Thanks all
> Dave
> 
> 
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