Historical clue formulations

• Helical tools — 2026-04-10
• Boring things — 2020-11-15
• Wood borers — 2015-03-13
• Boring tools — 2005-09-13
• Boring things — 2003-09-10
• Drills — 2003-07-20
• Ice fishing tools — 2003-02-09
• Bits of carpentry — 1999-11-06
• Some bits — 1998-05-08
• They're boring — 1997-08-03