A hood is not just a practical tool, it mates to your lens like two lovers with a kindred spirit, sharing a single purpose for that perfect union. A lens with a hood tells the mindset of the photographer that s/he is serious, cares about his/her art, and the attention to details. Even if you lack the original hood, and you improvised a Frankensteinish contraption equivalent, it's made with love, to perfect the sacred act of art creation with photons (or silver halide). In fact, it would draw awe from fellow hood addicts with admiration, and respect for your unyielding dedication.
Mery-Optik Trioplan 10.5cm f4.5 with the perfect hood!
We don't know what the lens designers were thinking when they drew up the lens design, some lenses were never designed with a hood in mind, let along came with one. If you possess one of these lenses, it's usually a time of frustration, at least initially, because nothing seems to fit. No amount of glue, electrical tape would help. If you have one of these lenses from hell, don't despair, persevere, and you will eventually see the light, and could even be intervened by the divine! I will give my personal experience for such a lens.
The Meyer-Optik Trioplan 10.5cm f4.5 is lens that is not kind to hoods. None of the 253 [figuratively speaking, could be more, or less] hoods I have fits. I tried Krazy Glue, LOCTITE, JB-Weld, metal screw but nothing helped. Electrical tape is out of the question as there is nowhere for the tape to adhere to. Time to give up? No way! Nothing can stop a hood addict from mounting a hood on the lens, however impossible it might be. Eventually, after months, I was directed to a piece of brass rod. A perfect piece of rod that's correct in size, length, and is blackened inside, and most important, it fits perfectly. Tears filled my eyes. It's clearly a sign of divinity. There is a Lens God that listens to prayers and pleads from frustrated hood addicts. Morale of the story? If all else fails, don't give up. Pray to the almighty Lens God. In other words, keep looking until you find what you are looking for.
Anything Goes. Minolta hood on Leitz Lens.