We had a problem with the weight balance due to the unique design of two large wheels and only a nominal caster to prevent undue total flips. This prevented him from climbing any significant slope, including the hump on the Lava Palava course.
The answer was a larger "nose" with a heavy weights (i.e. washers bolded on) to the tip. This also required a new omni-wheel caster as the original plastic ones were just not strong enough and broke.
After fitting it, we tested on the test Lava Palava track. Success!
Next issue, how has this affected the dynamics and can he still follow the course?
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