HELP with Magneto

Im part of a student group restoring a 29 John Deere D for the Nebraska Test Lab museum. A rebuilt splitdorf magneto was donated a few weeks ago but it will only spark on the left cylinder. All of the brushes look new along with the points. What could the problem be. When we turn it over theres a good snap and spark on the left cylinder, on the right theres a little click and at the points a very faint spark once in a while. Any suggestions would be helpful.
 
I tried everything I thought I tried switching the wires. I dont even have a spark at the points on the right cylinder
 
Are you mounting it and getting no spark or is it on the work bench? If it is on the tractor I would double check for binding on the coupler? Just a long shot here. The next thing could it be a bad bushing / bearing?
 
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