Shorten axles with a simple jig
Shortening toy axle pegs doesn't seem like it should be a troublesome job. But you can't lay the axles on the saw table for a safe cut because of their mushroom-head ends, and their small size makes them hard to hang on to.
Construct this simple jig. (We show one for trimming two different axle lengths or diameters; you could make a jig with only one notch for just one size.) Slide the peg to be shortened into the appropriate hole, inserting it from the notched side of the jig. Then, holding the peg end against the inside of the notch, cut it flush to the end of the jig with a bandsaw, scrollsaw, or handsaw.
—David R. McClellan, Markham, Ontario