Golf tees, natural finish, 3"-3.25" length.
Readily available tamper + pick, & you don't have to get all fiddly with Czech tools, pipe nails, butter knives, screwdrivers, pencils, etc.
Easily reaches the depth of MM Generals.
They are one of the cheapest pipe tools, & like the MM Cobs, there will be no weeping, & gnashing of teeth if you lose or break one.