it says on ebay that it works with a600, if a regular amiga mouse worked, so shoudl this, I am using it on a Amiga 2000, and it is a very tight fit because ports are recessed behind front of case...
You're using this adapter on A2000 but not on A600.
See picture below:

We can all see that this adapter can not be inserted in mouse/game DB9 male interfaces of an AMIGA A600! ...except perhaps if you have this cable or similar:

If you take pictures/videos of this adapter running on an Amiga A600, it would be great for the whole Amiga Community.
Thank you.