Son and I participated in the pinewood derby in the mid nineties. We did our homework and won three years straight on wooden track. Basically, 5 oz, weight in rear of wedge, ran on 3 wheels. ( one of the judges pointed out the “errant” wheel so we could lower it before the race and run much better!) Now a family friend’s Cub Scout has asked for help in his first year racing. So much new online to increase speed! Bent axels, better lubricant than graphite, etc. Any hints on where to start? Thanks!