Just intalled 2" spacers between Jack plate and motor. After all bolts tightened, I took a flash light and ran up and down the spacer. On the motor side I can see a gap between from the top to the upper bolt on both spacers. there is also a small gap above the the lower bolt. Already tried serveral times to adjust the tightening of the bolts, but nothing changes. Is this normal or do I need to shime?