there was a "slope kit" to prevent this. Check to see if you have it in. It will be a false bottom bolted or riveted to the origional bottom, discharge side, front slide area behind grain bin. Bulletin n 0007 Gleaner service
We like to plug holes after removing wires. Gleaner has a nylon or plastic plug kit for this and that is what we use. Some people fill hole with liquid plastic or steel. Some install steel rivet and tack weld in.