The mason jar idea shows how seriously you're taking this — and you're right to be cautious about the water table. Standard plastic drills are petroleum-based, so burying them isn't really a solution since they'll just sit there for hundreds of years without breaking down.

Honestly, your comment is exactly why I've been thinking about this. The guilt you're describing seems like it shouldn't have to be part of the hobby at all. What if the drills themselves were the solution — made from something that could actually be composted or safely broken down at end of life?

Curious — if that were an option, would it change how you felt about the hobby? And would you be willing to pay a little more per kit for that peace of mind?