I don't see how (at least for 1/4" ply). According to the info on the set,
the smallest groove it will cut is 7/32, which is already the size I have
(which is too big). It's too bad, because they're the only ones I've seen
that have the correct diameter (1.75").
It's pretty easy to grind a carbide bit down if you have a
diamond sharpening stone and a digital vernier or mic. I
ground a 6.3mm one down to 5.5 to make a cutter to fit a
guitar truss rod (roughly your sizes!). If you haven't got
a diamond stone yet, you don't know what you're missing!
Work out how much you have to take off each side, then
grind down one side all the way, checking for *parallel*
as you go with the vernier/mike (the other edge is your
datum). Then flip the tool over and grind the other side,
also checking for parallel. Takes no more than ten minutes.
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