Certainly in every family one goes bad or becomes unnecessary tricycle. And then sell it or just throw it away. Meanwhile you can give him a new profession and it will serve your children even: out worn the tricycle will make a great scooter. At the time I made this for my three year old son. Instead of wheels on the rear axle put on rock skis. And the front fork set on rocking the same — the steering ski.
I bought the smallest ski. Sawed off the back, painted with a colourless varnish. Rocking strengthened in the middle of the skis (so that it was balanced) rivets nails Ø 3-4 mm and they are inserted from below into the ski; their heads due to countersink the soles of the skis are flush with it (on each rocking chair — 6 rivets).
On the front fork should make two holes for bolts M10: the lower bolt is rocking, and the upper, elongated, serves as both a footrest.
Shop “Skilful hands” bought the tube with inner Ø 10 mm and made of a sleeve with a length of 30 mm. Of strip steel with a thickness of 1.5—2 mm cut blanks for pumping units — 3 PCs.