An insole or footbed for footwear includes a flat support element from which mushroom-shaped formations extend. The method operates on an ordered set of source symbols and may generate zero or more redundant symbols from the source symbols, wherein data is encoded in a first step according to a simple FEC code and in a second step, data is encoded according to a second FEC code, more complex than the first FEC code. A speed change unit 10 is provided between the first output shaft 4c of the first power distributor 4 and a power output shaft 11 linked with driving wheels 2, 2 of the vehicle, and rotation transmission therebetween is achieved at a plurality of stages of speed reduction ratio. The stabilizing system improves processing stability by preventing gel-particle formation, improved storage stability of the curing compositions by inhibiting formation of overhead popcorn and suppressing drifts of resin viscosity and gel time.