Hi... did you ever figure this out? I have a Modalo, lockable 4-watch winder. It has two big winder circles that hold two watches each. Pretty standard I think.
I believe the belts have worn out. I had this challenge a couple of years ago; I sent it back to Modalo; they fixed it and sent it back to me.
This time, I've had Modalo send me two new belts, but I can't figure out how to get into it. When I look on youtube, it looks like you just twist the part of the winder that holds the watches (just the inside piece) for other winders that look like this. But this one seems