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too narrow to sharpen

if you had a narrow strip to pack out the blade, is there enough material on the blade to clamp it?
If there is you could get metalsupermarket to guillotine a thin strip of aluminium. The shop nearest me - i'm assuming you are in the uk, charge 50p/cut and the metal would be pennies

i have a milling machine and ran a dial gauge along both the sliding extrusion and the fixed steel part and they are both not exactly flat so maybe the combination of two errors and the blade at a shallow angle will cause this error. i'm going to take a very light cut off both parts where the plastic strip was glued and try again
regards
carl

 i have a T8 and an svh-320 planer blade jig. My planer blades are 10" x 3/4" so fit the jig well. I can true the wheel with the diamond attachment and grind a good edge on the blade BUT if i place the sharpened edge on a surface plate it is not flat. The strip of ptfe tape on the jig was bumpy and uneven so i removed that but still cannot get a straight edge.
any ideas?
regards
carl