Hello, I hope someone can help me out. I have a Potensic T18 that needed new gears. I ordered them from Amazon. After a lot of digging, I found out that they made different gears in the 2018 vs the later models. My 2018 model has finer teeth on the motor pinion gear. So I have the newer gears, but I can't find the motor gears to match the newer prop gears. Do I really have to buy 4 new motors just to get matching gears? Where can I get the right size? Thanks.