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Sounds like this: Which can be found in set 8364 only. It's recharged by pushing the car on a charging track piece, itself powered by batteries: . Not particularly good, but the sheer number of track parts in the set makes it interesting to buy for some people.

The best solution is to create custom LEGO-compatible bricks that your servos (or other parts) fit into. This can be done by: modding existing bricks with knives, glue and other tools building bricks from other material (wooden LEGO, formed with Fimo/Sculpey...) building bricks with a 3D-printer (for instance see the LEGO category on thingiverse). There ...

Depending on your rigidity requirements, I've found double-sided tape to work well. It's cheap and found in many general goods store. The servo itself can be taped and supported on all four sides and/or the bottom to many types of lego brick surfaces. You can also use double-side tape to mount a lego surface to a servo control horn. That provides nearly ...

Credit where it’s due, Keshav Saharia’s gates were an attempt to simplify those found here: http://www.randomwraith.com/logic.html If you look carefully Keshav's gates you'll see that they suffer from a fundamental flaw in that they can't be reset, the input rods are completely decoupled so pulling them out does nothing. RW