CFR Firewall Shifter Bushing, Fasteners Options

[TargaToy]

I'm installing Chris Foley's firewall bushing which is a beautiful design.

Has anybody installed one using fasteners other than the sheet metal screws or pop rivets that came with the kit?

I've been contemplating installing #10-24 riv-nuts after reading someone else's experience with either the screws or the rivets (I can't remember which) working loose over time.

What's your experience?

[ChrisFoley]

A friend of mine said he installed one with self tapping screws so he wouldn't have to drill holes first.
A couple of people have told me they had to remove it after installing with rivets, and then had difficulty acquiring 3 more of the 3/16 x 7/8 pop rivets.
One customer mentioned that drilling for the screws had a downside - the small drill bit can go offcenter easily enough that the screws become difficult to install. A simple solution is to wrap the drill bit with tape, but that may come under the heading of an "advanced technique" which bears mention in my installation instructions.

I would consider offering (or including) an alternate/upgraded fastening method if there was some consensus.