I was a bit distracted last night to follow-up on your other topic.
I have a DX7s which should be close enough from your DX6i.
Here's the
DX6i manual. I'll refer to this manual.
A two-position switch (like the gear channel) will go from -100% to +100% by default. You need it to go from 0% (bridge to the bow) to something like +35% (bridge to the stern).
I assume you have a 6 channel receiver that was supplied with the radio and you're going to use the "Gear" switch. If your radio is Mode 2 (throttle on left stick), that's the
Q switch as seen on page 5 of manual.
Power the TX off.
Press the roller and hold it down.
Power TX on while roller is down. You should now enter "Setup menu". Release the roller.
Click (press and release) the roller.
Turn roller and select function #3 : Monitor.(if the TX is already on, on main screen, press the roller for 3 seconds and it should switch to "setup menu")
The monitor screen is really helpful when setting up mixes, adjusting trim or servo range. It allows you to quickly check what you're doing without having to wire everything up. It is of course essential that you test everything with real servos once basic TX setup is done. And be careful during the first "live test".
Now that you're on the Monitor screen, move the sticks around to identify what control "drives" what channel. Then flick each switch and see how that translates.
Gear switch should be connected to channel 5 and go from -100% to +100%.
Connect winch servo to this channel and again flick the switch back and forth to see how it translates on the servo end.
If the winch is turning "the wrong way", you must reverse the channel. Having a servo arm on the servo will help visualize actual range/angle.
If you need to reverse:
Press roller for 3 seconds to exit Monitor screen
Turn roller to select function #4 : Reverse
Turn roller to select channel (Gear)
Press to select
Turn roller to reverse channelNow that we've identified what channel to use (and it's turning the right way), we can now reduce servo travel.
Press roller for 3 seconds to exit Monitor (or Reverse) screen
Press roller for 3 seconds to exit "setup menu" and return to main screen (which shows model name & number, TX battery voltage ...)
Click roller to enter "adjust menu"
Turn roller to select function #3 : Travel Adj
Click to enter Travel Adj screen
Turn roller to select Gear channel
Click to select
With the switch in its "off" position (bridge to the bow), use turn roller to bring travel down to 0%. Servo, if connected, should move accordingly.
Flick switch to "on" position (bridge to the stern), value should now have jumped back to 100%. Use roller to bring down travel to desired value, looking at the servo. Using a winch servo, I assume you would end up with as little as 30-40% of travel to get 180°.
Only problem that will arise is that those winch servos are quite fast and rotation might be a little wild (. Sadly even "mid-level" transmitters like the DX6i/DX7s don't have servo speed adjustment. There are dedicated electronic circuits that plug in between the servo and the RX and that let you adjust speed. Here's
one at HobbyKing.
As for sketchy ideas, I have my own.

As my Springer is nearing completion, I'm thinking of building a small barge. Then of course arises the question: what should I move around with said barge ?
And then I came up with the following idea:

That's a 25" 12-volt boat horn. A cheapo probably-chinese-made horn with a 12v compressor. These can be had for around $60. Add a $10 brushed ESC and a battery (I have 3S Lipos from my speed boat) and you're in for some good fun I suspect.
