Last year, I got a black mount J-8 to use for an LTM conversion of a 1936 Sonnar. The conversion was duly done and the Sonnar is currently on my IIIf. The J-8 came with a free Zorki 4 screwed onto the back of it, which has been lying in its case unused. Since my Fed 1 is still in bits after the slipping curtains issue came to light, I'll be pressing the Zorki into service.
Just after I did the black mount conversion, I got a hankering for the Sonnar to go into a silver J-8 mount (because it's non-rotating), and managed to pick one up. However, this J-8 was just too good to use for a conversion - it's a 1959 and is pristine. I decided to keep it as a J-8, with the plan being to get the Fed back together (using a Fed 2 mount and some shimming to set up the lens registration to standard). I took the Zorki and J-8 out for a test roll at the weekend, and am happy to report that everything seems to work well - no pinholes, shutter behaved (1/2 and 1sec a tad slow), and focus seems good (best I could do with the film and light was 1m at f5.6). The RF patch is a bit dim compared to my Leicas, but is certainly usable.
So, my FSU kit for this year will be this 1957 Zorki with the J-8 and my J-12 which hasn't been used since I replaced it with a CV Skopar. Turret finder for the 35mm.