This little bronze worm wheel, part of a 40 year old engine, failed last week.The makers were able to supply a replacement by next-day delivery. When the engine was new in the 1960s, they were listed in the manual at £3 10s 2d. How much today??
Allow not just for inflation, but for the company existing now mainly as a spares supplier, & they quite likely only turn over single figure numbers per annum of this sort of thing.