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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.

http://img.photobucket.com/albums/v6...1904883798.jpg

http://img.photobucket.com/albums/v6..._214758141.jpg

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