I have been catching up on your very informative blogs in my spare moments and just read this one. Of my two 14xxs (one Dapol, one Hornby) both are OK runners. I too seem to remember stretching one of the rear axle springs, which I don't recall. On inspection all rubber bands are absent! Wonders never cease. Way back the eager young sales man at Kemp Models of Hove, home of Perseverance at the time sold me a chassis kit and Airfix body. Alas my soldering skills at age 20 were naff to say the least. I might just fit the front Dapol axle to the middle of the Hornby chassis and swap bodies when changing periods. I'll try