I build model boats, plank on frame hulls. Small planks are expensive, I like to make all I can myself anyway. A few years ago I purchased a small cheep band saw. A Kinzo unfortunately the size blades it uses are no longer available. I have been cutting longer blades, scarf jointing with silver solder, not good for the temper of the metal, or mine. Thoughts of cutting the frame and razing the top wheel, a lot of work. Trying the smallest available blade around the existing wheels, I found if a third wheel was fixed to the side the blade would miss the switch gear & hinges. This still allows the the short blades to be used as well.
In the back of the case where 2 boss, drilled & tapped them 5mm .75 tpi. I intended cutting a 1/4" plate to carry a large bolt for the wheel axle. Looking in the rubbish store, found an old T.V. stand, cut the bracket from that. The wheel hard rubber 3" diameter + 1" wide & .5" hole, saved from a commercial kitchen trolley. The surface is convex, strange as it may seam this will keep the blade in the centre. The aluminium covering guard recovered from the inside layer of twin wall flue.