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Drill perfect holes in rod ends

SCATT0612

How often have you tried to drill out the end of a kit exhaust pipe, only the have the bit wander and tear up the side of the pipe?

Or if you manage to start a hole that doesn’t drift, it’s so off-center that the entire effect is lost?

“Here is a tip for drilling out scale exhaust pipes. Put a piece of tubing over the exhaust pipe. Slide a second piece inside the first, then insert your drill bit into that one. Using a pin vise, you can now drill a perfectly centered hole that will run straight down the rod without drifting toward the side.”

Telescoping, thin-wall brass and aluminum tubing are available on line or in a well-stocked hobby shop. If the diameter of the inner tubing leaves you with a smaller hole than you want, use that as a starter hole and enlarge it with a larger bit. 

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