This past September we have made a slight change in the spindle shaft requiring a shorter bolt. All three of your bolts should be the same lengths. You've said in the past that you use twin blades on your machine and you requested a longer bolt to accommodate the extra blade. Is it possible you mixed up the stock bolt with the modified system bolts? The attitude of the dealer concerns me. If he walked away because of the twin blade system I don't blame him, if that wasn't the reason I would be disappointed.