Trinity Monster stock arm?
 

Where can I buy just a balanced armature? I have a Putnam motor that I only have about 6 runs on that the armature gave up this past weekend. I e-mailed Putnam, but as usual, he will not respond. Thanks for any and all suggestions.;)

bad arm
 

Did part of the stack come out from the balancing to deep?

CALL DC MOTORSPORTS

I'm not sure what happened, motor will run at about half power for about a minute and then slowly die as it heats up until it won't run anymore. Has low rpm on my motor checker also. I put another arm I had in the same can and endbell and it works fine.

Could be a loose wind. You can get replacement armatures (get the "Pro" version so that its balanced and diamond trued) at Trinity's webstore.

still lookin for a armature...here is a part # for a monster stock arm.#EP1113.-hope this helps, Steve Bahnatka