I've heard guys talk on here about running doubles on their mowers. I was thinking about trying this for leaf cleanups this fall. I was thinking I'd get better suction and shred up the leaves better. My question is how do you do this. Do you just cross 2 blades and bolt them up, or what? Will they stay in place, or do you need some sort of bracket to hold them at 90 deg. angles. Thanks for the help.