Cascade keeper throat guard on CPX

[cougarclaws]

I have a clear cascade keeper's throat guard that I bought for my old CPro and I want to put on a CPX but the CPX has vents where I drilled the holes in the chin guard on the CPro. Is there an extra piece that goes behind the CPX chin guard to hold it in place? The square backing falls through the vents on the CPX. Or am I supposed to drill a hole in the spot I'm pointing at with the letter opener in the picture below?

http://i194.photobucket.com/albums/z237/cougarclaws/Cascade001.jpg
http://i194.photobucket.com/albums/z237/cougarclaws/Cascade002.jpg

[NALC24]

the larger vent on the chin, just above the middle of that vent is where cascade tell u drill it.so from where your letter opener is go to the left and then up. thats where i did mine and its holding

[cougarclaws]

gotta camera you can take a picture of the hole with? I don't wanna phuck up my new helmet

[wmulaxer41]

there is a tutorial on this...