I finally found a video and was correct in thinking the wood base model makes more power with glass Cyl bore. I am warming up to this version...if one where to fit o-rings as tires it would nearly silence it's rolling sound, then modify it to steer so you don't have to chase it then it would start to be quite appealing, also saw a video if you put a little stand under the drive wheels lifting them only about 1mm it functions as a stationary engine. I found some discount codes so may give it a go.