I soldered a wire from R160 to ourside the RFI shield, and then connected the EZ hook to the wire there and wrapped it in electrical insulation tape.
My reasoning was that it was not possible to insert the entire EZ hook assembly through the hole in the RFI shield, and so running a line out seemed simpler.
Throughout the installation I was trying very hard not to directly hack the 5200 mod board, since if the upgrade didn't work, I was planning on trying to re-sell the mod to a 5200 owner. This was also the reason for the 40-pin IC socket cradle I made instead of soldering the 8 GTIA lines directly onto the mod.
Since I now know the mod does work, you could cut the audio line, feed the cut wire through a hole in the RFI shield, and then re-attach it. But if you use the EZ hook to attach to pin 37 of POKEY, you will have to carefully place the plastic part of the hook so it does not get dislodged when you re-assemble the 400. I didn't like the idea of that large hook assembly "floating about" inside the 400
HTH
Good to know... I was thinking the same thing about not wanting it "floating about"... I know I'm not going to try and resell it so I may just cut it and solder direct.
Not sure when I'll get around to it, but I've downloaded all the photos and pasted the info into a word doc.
I'll be sure to update when I do however!