I have a 1970 Ugartechea .410 SxS shotgun that I would like to have a sling swivel attached to the barrels. Obviously this is not a common job and there is not a lot of rib to work with between the tiny .410 barrels to drill and tap for the screws - so a somewhat delicate job. I know it can be done (because I have seen them on other similar guns), but I want to make sure I use someone that knows what they are doing and not some shade tree type. Any recommendations in the "general" BR area? Thanks!