By Keef from Caterham
Item plugs into the back and you plug your atari joystick into the adaptor. Tested with Arcadians (Galaxian Clone) and works perfectly. Delivered day after ordered and well packaged. I would buy from MonsterJoysticks again :-)
By TomDD from UK
Adapter works very well, only downside is it could do with a case, so I designed one you can 3D print https://www.thingiverse.com/thing:3320298