as for the set screws on the sides, they seem to be practically usless, mabye I dont know how to use them but if you tight them enough to prevent the blade from shift you cant get the blade back in after sharpening without loosing the screw thus negating the whole point of them
It may be the set screws are only a guide to help center the blade after sharpening. None of my planes have set screws and sometimes getting the blade centered is a little extra work. Not enough for me to drill and tap the sides of my plane to see if a set screw would help.
jtk
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)