The 315 number is not the model number, it is common to all Craftsman routers. If you go to the website and copy the link which shows your router I will be able to tell you the model number. If it is red and silver it is a 26620 which is a clone of the Bosch 1617. The collet must be snapped into the nut before putting it on the shaft. If you dont do this it will bind every time with every bit. Same thing with the 1/2" and 3/8" collets. The good news is once you get the collet off the bit and snap it into place you will not have this trouble again.
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Mike
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