It is normal. Simply use a larger drill bit and drill the gimbal mount for the unit then you will be able to finish the process of bolting it to the RamMount.
It's all coming together and we have you covered @ Shut-Up-And-Fish LLC
From *Sales *Installation Services *On the Water Education & Instructional Trips
we are your One-Stop-Shop for all Humminbird MinnKota & Motorguide needs & more
972 822 9285