How to Spot a Psychopath

It is, as mentioned in this post, not entirely easy to get Lego tracks - either the new big or old small ones, or ones improvised from other pieces - to grip the ground well. They're particularly lousy on smooth surfaces, like indoor floors or table-tops.

I am indebted to the excellent TechnicBricks blog once again for showing me that it's actually easy to increase the traction of the new-style treads. Just loop rubber bands around each link, or every second link if you want to avoid bands rubbing on each other.

OK, now I've definitely got to buy a bucketload of links, and make something that can climb stairs.