Of course some customers are capable of performing their repairs and maintenance themselves. We support them too by supplying spares, if not from stock, but as speedy as our suppliers allow, another reason for selling a range reflecting our own desire of speed and efficiency in our supply line. Most of the spares that we supply are done so within 2 or 3 working days.
There is such a vast range of machinery available these days from the various manufacturers, produced over many years, (gone are the days when there were only a couple of manufacturers with only a couple of models each). The manufacturers all use their own spare parts, to ensure that once they have sold a product they have an in-built future income, because people have to return to them to maintain and repair. Probably the worst scenario of this is a manufacturer who can produce in some instances 20 – 30 varieties of the same model name (the one you see blatantly somewhere on top in an easily visible place), but they can all use a variety of spare parts, creating for each variation a different production number.