You will also need that extra screw part for underneath, which sometimes can be found with vintage flashes to attach to 35mm cameras for film :
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Here's a picture of a replica screw part what to look for ... perhaps a WTB will result in acquiring one before you have to learn how to work a lathe :
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Just a word of caution when attaching that screw onto your Kobold flash ... the screw-thread inside your Kobold is not deep enough to tighten that screw all the way in, as seen on the actual prop ... so either you have to drill more room inside your precious vintage Kobold flash or remove some material from the thread on that screw part to make it work
Chaïm