I have a plastic recycle bin (UK type with green lid if you know what I mean). I want to use it to store solid fuel pellets for my burner. Got to make a sliding (up) door at the bottom to dig out the fuel. I know I need a 'flap' inside to stop the pellets jamming up at the entrance but not sure how to design the door with slider bits at the side. Cutting out the plastic would not allow me to use it to slide up and down (too narrow). Ideas much appreciated. I can't find a YouTube vid on this. Thanks.