I use the modified turkey baster method myself. I take a length of heat shrink tubing that just fits over the tip of the baster. Heat just that bit to make a solid fit to the baster. Of course, using the heat shrink tubing may be overkill since you could just force a proper size hose over the tip. But when I did the "baster enhancement" I had a length of heat shrink handy instead of a lenght of tube.
For those like me who pull for the winter, it's important to note (at least for my Universal 5411) the manual recommends completely filling the transmission for storage. I guess to keep all parts covered to prevent rust. Then, for the season, make sure the level is at the correct point on the dipstick (or dip rod in this case).
1st few years, I would top up the transmission in the fall. Tried to do "partial drain" to get the level right in the spring, but would just make a mess of things with most fluid ending up in the bilge and having to refill from zero anyway.
Last couple years, I just use the baster to suck out enough to get it back to the correct level. Will probably try to do a full drain without making a mess next year to make sure any wear parts are flushed out.