Hey Mark, looks like he was last seen here on IAP a couple weeks ago. Maybe you can email him through ISP if you haven't tried that. Here's an old post with his user info.
These are pressure casted tube in pen blanks. The tube size is for a Sierra/Gatsby style pen. Price is $12 each plus shipping. Check out my Etsy store@ PenblankzbyDesign
I had the same issue back in early June with Mike. He got back in touch with me in early July and was able to fill a 15 blank order for me. Just be patient.