I'm thinking about some metal tubing welded a bit like a splayed out capital 'H', that is the width of the bike and hinged along the middle bar of the 'H', whic

I'm thinking about some metal tubing welded a bit like a splayed out capital 'H', that is the width of the bike and hinged along the middle bar of the 'H', which you can push forward with your foot and has a spring on it. Attach rubber ends if you want to make it fancy.