I have a older Minnkota 101 36volt Maxxum trolling motor. My old prop was kinda dinged up, so I ordered a new one from TW. Went to put in on today and found the new one MKP-33 prop is the right diameter, but the prop doesn't have a flat in the hole where the shaft goes through. The shaft on the trolling motor also has a flat machined on it. Am I SOL ? Going to call MinnKota on Mon, but I'm thinking that that they don't make a prop with a flat. Any input would be greatly appreciated for sure!