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Thank you for that Morten, and a warm welcome to the forum. I look forward to future posts! :-)

PM sent, new shock spring forthcoming. For those who may have found this thread by searching for a similar problem, here is a very basic KIF primer, they are actually quite sensible and logical: KIF shock springs come in several incarnations, first thing is to determine which style you need. Trior: Elastor: Satellor: Ultraflex: They can look a bit similar if you haven't dealt with them a lot (and if you are reading this, that is likely the case), so try to find a reference for your specific movement if possible. If not, you will need to measure the old spring. Replacements are ordered with the style prefix, (1=Trior, 3=Elastor, 4=Satellor, 6=Ultraflex); followed by a size reference (1=1.30, 2=1.60, 3=1.90, 4=2.10, 6=2.30) My observation is that sizes 1 to 3 increase by increments of 0.3, and 4+ increase by 0.2 The complete part number will be style-size e.g.: 3-2 will be a 1.60mm Elastor Which is the part we need in this case. The Bulova-KIF reference material I was able to find did not include either the OP's 11ANACB or the 11AOACB that I was seeking originally. By checking Bulova service manuals, I was able to determine that these two used the same lower setting (112) as the 11ANACD which is listed in this reference, and uses the 3-2 KIF spring. KIF_Bulova.pdf