Jon bought the airframe 2nd hand, it had previously been registered through the LMA scheme at 21.5kg, but he wanted to try to get it under 20kg as lighter always flies better and it avoided the complication of going through the LMA inspection scheme. A friend who also has one, suggested Jon does a mod to move the engine forward from it’s standard position behind the centre of gravity, to in line with it, moving it forward around 300mm.
This turned out to be a lot of work, but resulted in removing over 500g of lead from the nose to get it balanced. Final finished weight was now 19.8kg. Following the test flights on the 31st August in the film Jon decided to add another 100g of lead as it was a little too tail heavy, so the model is now at 19.9kg.