Hi Mowefreak,
I agree with you. This is the only base I can find but a cross base would be stable. Yes it does fall over easily when pushing the mower. I'm in a rush to build something to hold the mower up to service the blades. I use to hold the mower up with left hand while undoing the blades with my right hand. My arms getting tired so I think I need to build something to help myself. If you have one built please share your idea.
Cheers,
TheCarbyMaster