Tandemkross Walther P22 Wingman modification to enable last round hold open

[Button Pusher]

I like the Wingman, it gives you 5 extra rounds per magazine but wanted last round hold open. My modification is internal to the Wingman and will also require you to cut the magazine so the follower button can pass into the Wingman adapters.
Dremel tool makes it very easy to do this mod. The spring is not shown in the photos. I have one more to mod and then I'll use a file to finish.