Lead hardness pencil testing trick
This is a simple mod of a pencil sharpener to prepare pencils for lead hardness testing
Insert pencil and mark the blade where pencil lead and wood meet
Use a grinder/file/? and remove the cutting edge where the pencil lead is
Insert pencil and sharpen until pencil lead sticks out past the wood the distance you like (I go a little under 1/4 in)
Flatten point of pencil lead with sandpaper
Push the flattened HB pencil tip across the prepared (flat/smooth area on the lead)
If the HB pencil cuts a trough and leaves a curl of lead (or a scratch), the pencil is harder than the boolit lead "HB" (14-15 BHN)