@Ogladio, be careful with the screwdriver when pushing that tab over. I slipped a couple times and really stabbed myself.
Put your thumb under the endlink when it's attached to the watch and with your other hand twist the band hard as you push straight down at that protruding piece. This will warp the band relative to the endlink, so press again hard, and twist the band the other way. You'll feel it bending and twisting and giving a little as you push down.
It will feel like it went into place, but mostly all you did was open the endlink "clamshell" way too wide. In reality you only moved the protruding piece a little. So keep going, be brutal with it. No mercy. BEND that sumbitch.
When you think you got some movement, take the band off and squeeze the "clamshell" of the endlink back down and reinstall the band. See how it looks. It took me 3 or 4 tries to get it where I like it.
@droptopman, I have 3 spare Yuki 7206s here, 3 mounted on watches, and I've sold off half a dozen. All of them fit my 20mm lugs just fine. The only one I had trouble with by the too-tall rivets was the MQ band.