90° Clack Valves |
| Drilling 90° Clacks Drill the cross hole first, then put a plug in the hole so when the drill breaks through the brass, it doesn't know what happened. If a steel plug is used, you can see the steel swarf from the drill and know when to stop. This came from J.A.Crew - bloody brilliant as I've wrecked so many bits of brass with oval holes when the drill snatches! |