Prepare necessary equipment and tools Milling machine / Drill press - Make sure it's clean when you start the job and that the pitches have been calibrated. Drill bits - Make sure they have been sharpened recently. Ruler - Span ruler that is accurate to at least 1/16" - Having a post to secure it can be handy. Bevel sander - We recommend putting on a new sanding disc for every ball you drill for consistency. Grease pencils / pinpoint scriber - For drawing the reference lines on the ball. If you want to use a scriber, make sure it's ok with the customer. Instant cure glue - For installing finger inserts, thumb inserts, thumb slugs and interchangeable thumbs.