Hey guys, over on the common parts for sale today (here on TC), I saw a 621 housing for sale for $50 (if it is still available). This is a really good buy for one. The ad said it had some minor damage on the bottom, no cracks though, but was excellent otherwise. This would be a good buy if someone is looking for a 621. Over the years, I have had several of these with minor damage or cracks. I've had them welded (by someone who is really good at welding alum), finished down the weld, lightly blasted it, and they were nearly good as new.