YUP, RV got that right. The pully on the Gates is the same pully on the Mazda. I just finished putting the OEM on a little while ago and it wasnt the idler bearing at all. ITS THE SAME DAM PROBLEM THE ULTRA POWER ECONO HAD!!! Freaking ram eye hole went oblong like the first marvel of penny pinching. The ram does indeed have a bushing that apears to have the abrasion resistance of pot metal!! You cant make this up..... Look for your self.
Pully to ram distance when new

Ram end close enough to bounce of spinning pully causing belt chirp

Heres the culprit up close

Back when I worked at Auto Ordnance, it was my job to go Rockwell C a sample of any vender parts we got in for the 1911. If I remember right, sears had to be just under 40. Once they came in at 36C and I sent all 3000 of them back to the heat treaters.
So all these aftermarket buyers bought thousands of these tensioners, put their name on them and now must be getting a raw behind from the flood of complaints! Gotta Love it. Send that tech back to the rice paddies! Lucky if thats all that happens to him......