[LostTribe]

>...running a common garden hose in under it and letting the pressure of the water shift the sand away so it will drop down into the bed.

Yep, that actually works. I've sunk long iron water pipes straight down that way, for use as electrical grounds. Just use an iron pipe to water hose adapter. Varies with soils. Your mileage may vary.

[William Terrell]

Beats posthole diggers all to hell. However, Alabama red clay is somewhat resistant.