mini is too mini for my 2 SPTs

[peterm]

This type of coupler might be worth a look:
[ATTACH]10511[/ATTACH]
It is normally used to connect a hot water baseboard circ. pump to its motor and is only about an inch overall wide when installed.
[ATTACH]10512[/ATTACH]
The one I have here is for 0.5" shafts but could be bored out to 5/8" but might not be strong enough. Just a thought.

[SDSSmith]

This type of coupler might be worth a look:
[ATTACH]10511[/ATTACH]
It is normally used to connect a hot water baseboard circ. pump to its motor and is only about an inch overall wide when installed.
[ATTACH]10512[/ATTACH]
The one I have here is for 0.5" shafts but could be bored out to 5/8" but might not be strong enough. Just a thought.

Imagining that thing spinning exposed is scary.

[robinson46176]

If you need hose for a drive coupler go to a farm store and get double braid hydraulic hose. You can also find it at a regular hydraulic equipment service center. Wrecker supply vendors also usually have it.

[peterm]

Rob, you won't have to imagine, see below.

I bored out the well worn example I have for a trial run:
[ATTACH]10513[/ATTACH]
Here it attaches a bandsaw. The coupling is 1.25" from headstock side to bandsaw side.
[ATTACH]10514[/ATTACH]
Here it is driving the bandsaw. A guard would not be difficult to cobble up.
[ATTACH]10515[/ATTACH]
You need the shafts lined up well or the coupling will wear through prematurely. My example came off my furnace just before failure and is severely worn so I did not try cutting wood with this lashup.
[ATTACH]10516[/ATTACH]
These couplers are designed to run for thousands of hours on a furnace but shaft alignment is usually near perfect. So, it appears like it would work, but all in all, I think I would not recommend this idea and would instead pursue a coupler involving a short piece of hose.