Accelerator position question

[Putter]

I am switching from a rod type to a cable type accelerator. I read a couple of threads on the exact same subject within the last two weeks, but now, I can not find them.
And that Google search-thingy is not helping me.

Anyone have those photos saved that were posted about the measurements, or have the link to those threads??
I just need to know where to mount the actual tri-angle bracket to the firewall. I can figure the cable part out from that point. I figure someone will suggest I just mount it where it feels right, but I don't want a bunch of trial-&-error holes to fill.