(Hap and Jeff's posts and my reply from the Spridget forum):
"The tab washer is only held in place with a small hole in the rear housing, if it should slip under the heavy rigors of racing, it acts like a hand and can simply turn the nut off the threads of the rear end housing, so no tab washer at all. The nut can sat right up agint the hub bearing."
Hap
"In addition to what Hap mentions, they are soft, can give erroneous torque readings, and may crush under load, causing the above mentioned scenario to happen."
Jeff
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Hap and Jeff--
Thanks for the input. Being a bit short on time I resumed working on the car this morning after posting without waiting for your replies. I pulled off both nuts (L & R) and saw that the tabs that engage the holes had in fact been filed off so I reinstalled the nuts WITH the washers using red locktite and 140 ft/lbs. Both nuts felt solid and could no doubt have taken more.
Now that I have read your posts I regret my impatience and having reused the washers. I considered not using them but it looked like they would serve to better distribute the load against the bearing and perhaps provide some safety were the bearing to sieze. Since they were already torqued against several times perhaps they have already crushed?