I spent $1.02 in Home depot for this very important piece of gear I carry on all gigs!!......yes ladies and gents The RUBBER Door Stop !!!
I saves my butt every time,......if you ever been to a gig and then find out that where your setting up has a floor that is so Off Level sometimes over an inch or more it ain't funny making your KB rock back & forth? .......
Well my best friend the Rubber Door Stop fixes it every time!! ...

Don't leave Home without it!!