Step 1: Materials
• 18m x 50mm diameter hard PVC tubes
• 2 x T-section tubes, 50mm diameter
• 8 wheels, ideally rollerblade wheels with screws, bolts and washers
• 3m of plywood
• Some sort of shock absorbing material: foam, yoga mats or springs.
Optional (for dolly track rails)
• 6m of plywood
• 2m of 2x4 wood
Tools
• Saw
• Drill
• Strong glue
Tip: Ask your local hardware or furniture store for their wood leftovers.





































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At the moment the wheels are drilled on the sides of the dolly cart tube itself, with only a minimal distance between the track and the cart. I believe the parts you suggested would place the wheels in between / under the cart, creating a space of a few cm's between the cart and the track.
There's two reasons that in our movie project we like to keep the distance between the tracks and the cart to an absolute minimal. Firstly, safety is crucial. With more contact surface between the track and the cart, we might have less chances at accidents. We're using this dolly for action packed scenes on the street, so at times it gets rough.
Secondly, at times we like to make shots very close to the ground, in frog perspective. Often a cm or two does a lot to a take.
Considering our budget, we were also forced to opt for the cheapest solution.
For other photographers these spare parts would be an awesome solution: my guess is that they're easier in assembly and more solidly built than our wheels.
A concern could be that you would loose contact surface between the dolly cart and the dolly track. I used this dolly for some shots of a man running through the street, and in order to follow him the cameraman had to run the cart over the track at equal speed. I'm afraid that if I put the cart higher up, and consequently the tripod and the camera as well, I might loose on safety.
If you try it out though, I would be very interested in hearing how it wen