I found that the Myford oil gun, was a scatter gun, lubricating everything except what was needed.
I bought a Reilang. Relatively more expensive than the Myford article, but the difference is that it puts oil where you want it, with almost no leakage, and will work in almost any position.
It has been a good investment, thoroughly recommend it.
With regard to spanners, it is possible to tighten / slacken hardware with a slightly oversize open end spanner, by inserting a packer of the correct size between one of the jaws and the flat of the hexagon, or square.
better to use the correct size, but sometimes, the devil drives, where needs must!
Howard