Well, the oak for my mortar base is dry. I went up to dad's today and squared it up on his table saw. I'm going to Sears tomorrow to buy a drill press (been wanting one forever... it's about time) to drill the assorted holes.
Anyway, I have lacked patience to finihs the base. I just completed my third firing session with the barrel propped up on a piece of firewood. The sponges are holding up well. I examined the fists sponge (the one that gets the bucket) after I was done cleaning the barrel. The "barge cement" it holding up nicely. It is ignoring the water entirely. The synthetic sheeps woool shed a bit during the first firing session, but that has stopped by now.
I wondered about maybe having my wife sew a "sock" out of cotton bath towel that I could slide over the sheeps wool and tie in place. I havn't done that yet, but she was nice enough to pick up a towel so I guess it will happen. It is an experimental imporvement, but right now I am happy with things as they are. Having two "drying" sponges is nice. I can really soak the heck out of the barrel with the first one. The second one removes 90% of what I leave in there, and the thirs one takes out the rest. They seem to dry between rounds, so they continue to do there job.
I think if I went to an extended match I would bring a second set to allow them to dry if they got too wet to do their job. They are cheap enought to make that it wouldn't be a big deal. I think they cost me between 5 and 10 each to make, and they took about 15 minutes apiece in labor.