Axles
  The Axles on the Yesteryear models were made from mild steel. During manufacture of the very early Yesteryears a wheel was threaded onto an axle, one end of which was riveted, and then the axle was passed through the model. The remaining wheel was threaded onto the axle and kept in place by crimping the axle end. This crude but effective method was used for the early releases of the first 10 models (exluding the Fowler and the Tram) up until 1958. Unfortunately this method left rather sharp edges, clearly a hazard to young children. Therefore the crimping tools were replaced by tools to squash the end of the axle toward the wheel to form a second rivet. This end always shows a smaller rivet than the rivet formed with the axle off the vehicle but produces a much safer and neater axle end than using the crimping technique. All subsequent axles are found with riveted ends.
 
  Wheels from the Y10-1 Mercedes are shown here. The one on the left shows the riveted version and the one on the right is crimped
 
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