Originally Posted by
toyfountain
I don't know about the horizontal mount, but on mine (vertical mount) that's where the tension of the chain is adjusted. If I were to open it up to make a dropout slot another method to adjust the chain's tension would need to be figured out.
Another problem might be to remove the small chain from the sprocket. The only way now is to adjust the tension to the minimum.
Toyfountain
Your concerns make sense to me. I forgot to mention in my earlier note that this gap in the motor mount plate would necessitate a fender washer ( a round slab of metal with a hole in middle) to bridge the gap and allow tighting the wheel axle in place.
About the motor to freewheel/wheel chain, you can buy ‘master links’ doodads that allow a chain to be taken apart/put back together at a whim.
As always these ideas are worth every penny you’ve paid for them. No guarantee available at no extra cost