Looking for some advice with the Stacked dado set on my TS3650. Two things seem to have resulted during use or while installing to the Dado shims and the saw arbor threads. First noticebly the shims are pinched, should they be set between the blades and chippers each or in one slot together? The last time I used it the opening had been bent or pinched. The second problem is the arbor threads were marred this may have ocurred during the full stack of 7/8" were they went on tight. Note I did not use the washer just the nut with light tourqe. Any thoughts?