Hi, I bought this old box blade. It has two fixed blades but also a flap on the very back. Can anyone tell me what the flap is for? Seems different than most hinged blades iv seen. Plus it already has a rear fixed blade. Thanks
Built a 24 x 40 x 10 pole barn with attic. I know I scoured the internet for information before building mine, So hopefully I can give back.
Where I'm at after 1 year: