Matt Kunkel's Bearhawk Build Log

9Jun/102 hrs

Back Seat Install

I began drilling the rear floorboards to install the back. seat frame.  This took some time as I discovered that all step drills are not created equal.  At first I used a craftsman step drill with flutes on 2 sides.  That tool didn't work well and created a really ugly looking triangle hole.  After a lot of contemplation and drilling on scrap aluminum I discovered that the Irwin Unibit only has one flute and it stays indexed in the hole to make nice round ones.  I knew a step drill was supposedly the right tool to make larger holes in thin sheet, you just have to use the right step drill.

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