Modding ARES Amoeba Grip for SCAR

[paradoxum]

Sorry if this is a double post but after I submitted it I couldn't see it in the forum.

I found this thread: http://www.airsoftcanada.com/showthread.php?t=157394

Most of the pictures don't work or are linked wrong, but I think I got the jist of what I need to do.
I have no idea how I was going to create the shim between the grip and the gearbox but I thought I'd try buying some hard pencil erasers and cutting one of those up to size and drilling the holes needed. So I've got that now. I contacted the posters trying to get more info (like the dimensions of the shim) but I'm not sure if they are still active - any advice or anyone that has done this before?

https://i.imgur.com/PMGM3ip.jpg

Thanks in advance anyone,
para