How To: C15a Wire-3 restoration

[Lynn Eades]

Here's a hint Jordan;
My mandrel doesn't have a drill bit in it. I have a bit of plain round tool steel in it.
I drill a clearance center hole with an ordinary drill bit. I then put a bit of oil on the plain pilot, poke it in the pre drilled hole and cut away with the hole saw. It dont wobble at all.
The reason why I did this was that I had trouble buying the correct pilot drill and most of them leave the clearing flutes of the drill bit at the same height as the teeth of the hole saw, which allows the hole saw to move sideways.