I bought a 1948 Ford 8 N tractor. I got it running but now the starter will not engage the fly wheel. It spins but it didn’t engage the fly wheel. I assumed the starter just needed replaced, so I Bought a brand new starter and solenoid and put it on this time it did run the first time I tried it, but I go back out the next week to start it, and The new starter does the exact same thing. Now mind you the foot switch you can’t press it down completely, because ot won’t engage, so I press it until it engages the starter. Could that have been the problem instead of the starter. The old starter did work, but just quit after I had used that starter already. It ran like a dream. #Need some help.