Ok so basically I want to do an any% run of alpha 1 and I want to know how they do the lawn mower glitch where they knock the key down from with crib through the floor with a lawn mower if anyone knows how to do it

The title really says it all. I did a glitchless any% speedrun in alpha 1 of 1:10.29. The original leaderboard says that it wans't found, so I really have no ideas where to submit this to. Help?