Hi Pete,
back 'ome I used to buy 1/2-price used lumber "Inside every beat-up 6x6 is a clean 4x4" their sign said, along with "WE don't sell green lumber."
Their lot was a mebbe 15 foot high layer of salvaged lumber with a huge "flying table" circular saw in the middle to cut up baulks of salvaged wood into whatever size you wanted. The sawyers one hand had all of it's digits, t'other one had a palm with scar tissue and a thumb. The closest he came to the saw's blade was the safe end of his 6 foot push-stick.
But back to your own missing finger end. Learning to calculate in base 9-1/2 can't have been easy?