Hi everybody.
Regarding to the headstock thickness and width: In my opinion, you should first choose 2-3 keys set(s) probably to use - specifically for slots - and look up for their exact dimensions, as there are numerous differences amongst firms / types etc.
Keys (6x sets) plates’ widths vary (from 17 to 21 mm - the ones that I know of), and this might affect the headstock’s thickness.
Also, see to the length of the axles (24-29 mm is what I have used so far: 5 mm is quite a big difference). With the longer axles and (usually) inclined headstock's sides the "nearest" opposite keys (bottom or top, depending on the inclination's direction) the axles' edges may "meet" inside the headstock's "spine".
You can shorten them up afterwards of course, by various means, but knowing these “details” before cutting / drilling / routing etc. will keep you out of trouble.
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