My youngest son has Muscular Dystrophy and has very weak muscles.
I originally made a scooter for him, and when my older son wanted to play putt-putt, thought of a way to expand the idea so we could all play together.
It uses 1-1/4" PVC pipe for the framing, 3/4" PVC pipe for the putter, a scrap piece of shelving to stand on, scrap material for the seat, and hose clamps and carabiners to attach the seat to the frame.
Follow this link to see it in action:
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Step 1: The scooter frame
1. Cut 4 pieces of 1-1/4" pipe to make a square. I made mine 12" inches long.
2. Cut 4 pieces of 1-14" pipe for the legs. Make the height comfortable for whoever will be using it.
3. Connect together with 4-way slip connectors.
4. Add caster wheels -- I got the fittings here: http://www.formufit.com/1-1-4-7-16-pvc-caster-pipe-cap/
The wheels I got from HomeDepot