Mac88
Addicted to ArboristSite
I was just there and it looks like you are correct. Is there more to this than I am seeing? What are you suggesting? If you can get them that close to perfectly lined up what is the point of having the coupling?
I'm not so naive to think that I can get it within a 100th of an inch but what will happen? They claim fail safe and will still function without any rubber elastomer. I'll look for an adapter after I figure out what I have to bolt to and see if anything is available.
The coupling serves several purposes, among them ease of assembly and vibration dampening. Imaging trying to install a solid coupling between the two shafts in the limited space available. Yes, the coupling will function without the spider (fail-safe), but it will beat itself to death if continuously run that way. You can certainly build your own engine/pump mount, but to prevent unexpected failure of the coupling, engine or pump bearing failure or whatever, the mount must be built to pretty close tolerances. I'd be curious to know if your engine has a place to mount an adapter separate from the standard base mounting holes.