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It looks closest to a PT or one of the old PP hubs. I've been working on and around Mach's since Reggie owned them. It's not like any Mach hub I've seen. I don't claim to have seen them all, just most of them.
Here is the standard Mach hub.
I have some for sale if anyone is interested in a vintage propeller.

Pressing in a rubber hub won't work with the 3 ribs in place. Are there splines in the insert?

Brett

Its a labbed 34p on a 800+HP cat I don't know that a rubber hub will do the job.

SB I get it. But in reality I traded an old flat tapped can and lifters pushrods I couldn't use and a set of aluminum rockers for it. If someone would have offered me 100 bucks for the lot I would have taken it. Therefore I am not that worried about the deal. Just wish it had a normal hub so I could.drop in a 1.25

Bret when I get home I will take a picture of the other end of the hub. It looks like what you posted. What I posted was the drive side of the hub if you will . showed the pattern the best

I can't offer too much more help here but the hub Brett displayed is exactly the hub I had when I used a Mach 4 blade Sterndriver. The hub worked fine and the prop was super easy to install and remove. I did not however push that large of a prop nor with 800 hp.

Regarding performance it was probably the best all around prop I've ever used. In a way I regret selling it (I re-powered). It was smooth, fantastic out of the hole and virtually immune to blow out. The slip numbers at cruise were under 5% which was completely mind boggling. I think the number was actually lower but I can't find my spreadsheet for that prop right now to verify. It was not my fastest prop.

I can't say you'll have all the same results but if you get the hub situation worked out there is some light at the end of the tunnel.

Best of luck.

I've also read good things about them which is why I would love to find the bigger 1.25" hub so I can use it. It came from a similar 25-26' cat with 1.36 gears and 1000+ HP and ran very well. I will have 850ish and 1.5 gears and think this prop will be very close but it will not fit my -2 imco with large shaft