Actually... it's painfully easy...
You can easily make connectors out of PVC... this is the way I've done it (although there are several steps to it).
1) Buy a piece of the NEXT smaller pipe than your track.
2) Cut about 6"-8" lengths of it, however many connectors you need
3) Split the connectors lengthwise, so they will "open up"... there are a variety of ways to make this split, but I use a Dremel tool with a little cutting wheel.
4) Drive a wooden dowel through one of the connectors to enlarge its diameter. You'll have to pick a dowel the right size to make the connector just a little bit bigger than will fit into the pipe that you use for track.
5) Heat the connector (still on the dowel) with a heat gun for a couple of minutes. You don't want it to melt, just get soft.
That's it. When the PVC cools, it will be permanently enlarged into the new shape.... and now you have a connector that will squeeze together and fit into the pipes. We've made a whole bunch of these that we carry in a grip bag. If we travel to a distant location, we just take the connectors, buy the cheap pipe wherever we are, and ditch it when we are done.
This actually will give a smooth-as-silk dolly... if your skateboard dolly has 16 wheels. If it has 8, not so much.
T2
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Todd Terry
Creative Director
Fantastic Plastic Entertainment, Inc.
fantasticplastic.com