I've got the shaft made for the mule drive on my Speedex with a Deere deck project. I clamped the shaft onto the sub frame and measured for a belt - which I will get today. Assuming everything looks good with the belt in place I'll be ready to weld the shaft to the sub frame.
The shaft needs to just clear the front axle pivot, so it needs to be placed fairly precisely. Ideally I'd tack it down with the sub frame still on the tractor rather than risk it shifting when I pull the sub frame off. I'll be welding with a stick welder.
In the motorcycle world, where I'm most familiar, there is great concern about damaging ignition modules when welding on a motorcycle. I've never bought in to that - I don't see how if you get a good ground reasonably near where working it could damage the electronics. Still, I generally disconnect them just to be safe.
The Vanguard twin on my Speedex seems to have the ignition module buried under the shroud, so not quick to disconnect.
What kind of experience do you folks have? If I ground at the sub frame can I safely tack the shaft in place?