Revo+Tekno+MMM Combo = problem

[YogyBrushless]

thanks for the replys and solutions guys, spacers and small screws are hard to find here so scrap that, normal or long shank pinions means a new purchase and a wait of around 10 days to 2 weeks to get the stuff here (Kuwait).
i think i`m gonna grind the shaft a bit and use the same setup besides i have from 15 teeth to 20 teeth pinion it would be a waste of money to throw them away.
realy scared about grinding but here goes nothin


thanks guys