Hi !
I did a custom desgin for the 121 vcf and 150 ringmod.
i did the design spacing between knobs and so is as on the original curetronic design.
if you are interested i can send some photos
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Oliver, DL6KBG, JO61UB
Online-SDR:
http://dl6kbg.dyndns.orgBlog:
dl6kbg.blogspot.com