The video below shows how to de-stumpify his legs with "blu tack," increasing the overall length of the legs. I guess blu tack is just reusable adhesive putty that's used to hang posters on walls and such, without damaging either. Available at Walmart, Home Depot, Lowes, Michaels, etc. I guess the only issue here is whether it affects resale value to fill his shoes with that product. If I sell the figure eventually it's a used item to begin with--and frankly this mod improves it significantly imo. I've never used this material, but hopefully one can dig that stuff out of the shoes without any trouble.