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After reading the last post there may even be a loose pulley issue either fore or aft. Eveen if your belts were properly adjusted, if the pulley is loose that could be the reason for the tooth walk and hence the snapping of the belt. This would give the same impression as a too tight belt. Ive heard other places in the forum where there have been sheared pulley bolts, they are loose before they snap, and the bolts are much stronger than a belt, so maybe last time at the dealer they didnt check for this.
As far as special tools I dont think theres any but theres a lot of chit to take off. You may want to pull the frt pulley off to check the splines for wear, but if it was bad enough you could feel it with your hands w/o taking it off the shaft. Good luck and keep us posted. Enquiring minds want to know. Dont forget to look at swing arm bushings, you may be torquing and cocking the s/a maybe??
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