From a 1970s set 9 manual, model 9.4. There are a number of points in the construction.

  1. It is fiddly to construct with many half concealed places for doing up nuts and bolts.
  2. One of the drive 3:1 reduction ratios of which there are two, does not mesh properly. I had to rearrange it a bit.
  3. Some blue plastic plates are used which do not look too elegant.

It is however a striking model, and the pistons used to raise and lower the shovel, really look the part. Excellent.

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