Wow, impressive job with the restoration, I thought it was new equipment.
Did you sand blast, or just spend a sh*tload of time with a wire wheel or something???
If you are concerned about unplugging it you could simply cut a slot for each bolt on the short sides to allow the door to be pulled out when the nuts are loosened-provided you weld the bolt heads to the chute.
I don't think you will need more than four bolts to do this. You could weld the 3 bolts together with a small narrow piece of strap iron top hold them in place and just loosen the nits to remove the door as needed as long as you use fine threaded nylock nuts or loctite the fine thread bolts and nuts provide more strength in use and greater holding power.
Another option would be to use just 2 fine thread nuts and bolt sets with washers for the top and hold the bottom in place with a wrap around bungee cord as the cord would not be exposed to wear stresses.
you could leave the top bolts close enough to the top of the chute to allow them to be tight and also be able to loosen them a little to raise the door to make it easier to remove any snow plugging the chute.
Thanks, wire wheel, sanding disc, throw away paint brush & rollers :laughing:
I did weld in an additional auger support in between each factory one on the bottom auger. As a wild guess, I thought it might help feed and stiffen things up where the rocks, firewood & ice will be:laughing: