I have had long discussions with Hugh Lomas , who has retired, about the whole process of sleeving. He didn't know of anyone other than Mr. Merrington, in the states, that does it at this time. Finding suitable tubes is the biggest obstacle in the process right now. The actual machining isn't that difficult. The hard part is dealing with all the different dimensions of all the different parts, that have to be measured and adjustments made for every barrel of every gun worked on. Also if you want the seam TIGed there are heat treat issues that have to be dealt with. Then you need tooling for each gauge for chambering, rim cutting, and choke work. All these obstacles could be mitigated to a degree by volume, but without an economical source of tubes, it is becoming a moot point. The last tube importer had to order a minimum of 30 tubes of one set of dimensions. Say 12 gauge, 30 inch, .729 bore full choke. If a smith has to have to find 14 more jobs for everyone he takes in just touse up one order. That's why it's hard to get someone set up to do sleeving. As much as we love these guns, if a gunsmith has to decide between fried bologna sandwiches, or driving a forklift and feeding his family hamburgers, which would you choose.