No pawls, bidirectional, sounds like you're describing the line tender
I postulated earlier. The Barient winch
has more gain than this and you need two of them. This is just like my spinnaker
pole raise lower mechanism, except that mine has a cog for a chain instead of something to grab a line.
handle plugs straight into the wheel
that grips the line, the only gain is the ratio of the length of the handle divided by the radius of the wheel
. The line is never supposed slip on the wheel. Both ends of the line end on the traveler car. The wheel is free to spin in either direction. There is a lock that freezes the wheel when engaged.
I do agree, just take it apart, there are probably no bearings, no gears, no pawls. There might be something simple that holds the lock bar in the locked or unlocked position that needs to be freed up.