[–] Monkeyshinerbot3000 0 points 1 point (+1|-0) ago 

Rock crushers will do too.

[–] mfquesodindunuffin ago 

High power water jet would be awesome.

[–] Monkeyshinerbot3000 0 points 1 point (+1|-0) ago 

As long as we can add some aggregate to that, about pea sized gravel would be nice.