Always do this or anything when tinkering with a power tool with it unplugged.
You need to use two wrenches one that fits the flats of the collet at the opening and one that fits the flats of the collet on the spindle. I take it the Craftsman has a spindle lock. The Ryobi you have doesn't so the wrench that goes on the flats on the spindle keep it from turning like the spindle lock which is my badly drawn black wrench. So while holding the spindle still with the wrench on the spindle flats (the black wrench), you tighten with the other wrench on the flats near the opening of the collet which is my badly drawn red wrench, clockwise to tighten and anti-clockwise to loosen.
Hope this gives you an idea of how it works.
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You need to use two wrenches one that fits the flats of the collet at the opening and one that fits the flats of the collet on the spindle. I take it the Craftsman has a spindle lock. The Ryobi you have doesn't so the wrench that goes on the flats on the spindle keep it from turning like the spindle lock which is my badly drawn black wrench. So while holding the spindle still with the wrench on the spindle flats (the black wrench), you tighten with the other wrench on the flats near the opening of the collet which is my badly drawn red wrench, clockwise to tighten and anti-clockwise to loosen.
Hope this gives you an idea of how it works.
