I bought my master built a week ago and used it once with decent results on ribs. I want to put castors on it so I can roll it around. The new ones have #10 metric bolts on the feet amd I can't find castors to fit where I'm at. I remember a post that said they were 3/8" but the new ones are for sure #10 metric. I have a set of old castors and I'm going to TIG a set of # 10 bolts to them with a nut threaded on to level. Just thought I would put this out there for any one wanting to know the bolt size. If your not sure take one of the feet off and take to the hard ware store and match it up.