I believe it is www.argoco.com and their phone is 1-800-868-9766. You might just order a few to see how you like them first. For me their thickness seems to cause the Challenger not to run nearly as smoothly. So I now keep my 10 argo pads as pads of last resort.
Lee Watson at Challenger just sent me one of their new Argo-type pads to try out. Loved it. No vibration at all. I don't have their prices yet on these, but you can try e-mailing him at
contact@challengerop.com,
