Mapman, I believe you but without offending anyone, I feel it has to do with the nature and quality of products made in those times. Fuses were fuses and fuse holders were fuse holders. Not much variance required in something that, at the time, was considered not that important but in the end, was, as evidenced by your tweaking the fuses in their holders. 😀
All the best,
Nonoise
All the best,
Nonoise