Sorry to hear this is causing you some madness... it’s part of the experience I guess...
- On you Q1:
can you confirm which of the Ray recommended adaptors you purchased? He listed two above. The 74mm one was the Flaspower branded one.. the second one was a 70mm/momo.
description from the add: “Half Inch Polished Billet Extension Hub/ Spacer Kit for 9 hole Steering Wheel to GM 6 hole Adapter
* The 6 Bolt is a Original GM Style. About 73.6 mm.
* The diameters of the outside ring is 113 mm (about 4.5")
* The diameter of inside ring is 60 mm (about 2.4")”
if you have the 74mm adaptor & holes are close, sometimes all you need is to do I massage one or two of the holes a bit with a small file/ sand paper. I had to do that with one of my adaptors... You probably need to determine with of the holes is a bit out of center. This should be a 5 minute exercise.
if they sent you the wrong adaptor, I would go back to the seller and ask for an exchange...
best way to measure is center of the hole to center of the hole.
- On Q2:
the horn should be a pressure fit.. by your pictures it looks like you may just have to open up the gap on the horn button ( when looking at it from the back, between the horn chrome ring and the black plastic body) a bit to increase the diameter of the chrome piece on the horn. You can use a small crew driver to open up the gap a bit.... open it up all the way around the horn ring for an even pressure fit,
also worth noting, once the horn is in place, it’s should be a tight fit. When installed on the hub and the steering column, you will need an access hole in the adaptor to eventually remove the horn button from the hub.. by pushing it out from behind. Most adaptors have a pilot hole where you can fit a small screw driver or 3” nail to push the button out. If not, you can always drill one... I will dig out one of my old adaptors and post a picture for you if that’s of any help.
It looks like your hub has a ribbed rubber piece so you may not need an access hole to push the horn button out once pressed in to the adaptor. but do check this before bolting it all together... otherwise there will be no way to push out that horn button.
I purchased the first one because I made the 'assumption' that the larger diameter 6 hole pattern was 74mm. It has to be 70mm as from bolt hole center across to bolt hole center measures 2.75".
I tried to drill out larger holes on a similar hub adapter to the one that I showed below by Forever Sharp (pictured)
...the problem with that was that I could not screw the hardware into the hub adapter as the inner sidewall is in the way.
I have heard others say to bend out the three metal areas on the back of the horn button... but I don't understand how you don't push the button down into the hub adapter when pressing on it. Look how deep it sits within the adapter... is that normal? do I need to pack some sort of stuff in there to fill the gap between the back of the horn button and the deep void within the hub adapter? I can see bending the button outwards a little to get it a little more snug... but what if I actually use the horn real-world, and as intended (I am shocked and press involuntarily hard and push it into the adapter)?