Eh, I'm messing with blades right now... It's kinda ironic how usually, you'd think 15 blades in vintage german lenses looks awesome... Well, I'm messing with only six right now, and it's... not something I'd do on a daily basis
I almost feel bad for the German repair people who'd have customers come in with broken lenses with gazillion-blade apertures, and they'd have to assemble/disassemble that. Oh well, I'm determined to make it work
By any chance, could you pour some of naptha in a small container or something and ship it to me? The only ones I could find on Internet are gallon-sized, and I really only need oil-remover for this one thing. I can compensate it for you, if you want
And yeah, it's the one that has a removable front. It's kinda like zenitar, just filter go into middle of the lens, as opposed to rear in zenitar.