I can confirm that the 1.5 mm Allen key is the correct size. They are usually quite tight and will need a bit of force to loosen. (I just checked on mine.) Insert the short end of the key into the grub screw and use the longer end to loosen it.
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Regarding the select knob, the shaft is a D shaped one and the knob just pulls off, It may leave the metal spring section on the shaft which will need to also be removed.
I am replacing the SEL rotary encoder on the FT-817 and want to make sure I do it without breaking anything.
What size allen key (hex wrench) do I use to undo the VFO knob? I tried using a 1.5 mm allen key but I can't loosen the screw. I don't want to apply undue force and damage something by using the wrong tool.
How do I get the knob off the SEL encoder. Do I just pull it outwards while the unit is still fully assembled? Again, I tried pulling it off with some gentle force but it didn't budge. Since the encoder is being replaced anyway I'm OK with applying more force but I want to make sure that I'm approaching this the right way.