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The motor is part # 3092 and the base is model 3091. When you put the two together it becomes a model 309. A parts list is here. http://www.ereplacementparts.com/porter-cable-3092-type-laminate-trimmer-parts-c-129_1861_1865.html
A typical laminate trimmer is equipped with a 1/4-inch collet. The motor runs in the 20,000-30,000 rpm range – faster than most routers to compensate for the fact that the bits are smaller in diameter.
There are several different bases you can use with this tool.
One example swivels so you can trim edges at a variety of different angles. An offsetting base allows you to get into tight corners because the bit is located at the edge of the base, rather than in the center. When working with laminate, this particular base is great for creating a backsplash. You can cut around the edges of a circle with a roundover bit.
1. Unplug the tool.
2. Turn the knobs on either side of the tool to loosen the base.
3. Remove the base.
4. Press the spindle guide to lock down the shaft.
5. Use a wrench to loosen the collet.
6. Remove the bit and collet. You may have to tap on the collet to loosen; careful not to tap on the cutting edges of the bit.
7. Insert the new bit and collet.
8. Use a wrench to tighten the collet into place.
9. Replace the base.