Actually that used C3-31 for 10K looks pretty well equipped, I would be tempted if I wasn't so in love with my 'antique' 1999 C3-31.??
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If you should happen to end up without the dado option, I recently discovered that the .197" / .250" / .375" box cutter sets can be used with very little modification to the saw and will give you clean, smooth, and square slots and dados.?