From a 1970s set 9 manual, model 9.4. There are a number of points in the construction.
- It is fiddly to construct with many half concealed places for doing up nuts and bolts.
- One of the drive 3:1 reduction ratios of which there are two, does not mesh properly. I had to rearrange it a bit.
- 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.
There is a video of this model on YouTube, at time index 3:20.