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Message: <blockquote data-quote="Matt94GT" data-source="post: 32922" data-attributes="member: 7964">"In general, the 5-inch counterweight (p/n 874011) should be used with a 5-inch or smaller backing plate, whereas the 6-inch counterweight (p/n 699933) must be used with a backing plate larger than 5 inches. Weight is the true determining factor for the proper counterweight, not the backing plate or pad size. If your machine vibrates excessively, you may need to switch counter weights. You will need a Torx driver (size T15, not supplied with the machine) to swap counterweights.While on the subject of weight and counterweight, the lighter the backing plate and pad combination the more efficient the machine will be. Some suppliers assemble backing plate and pad combinations that have no business being connected to the Porter Cable 7424. After several years experimenting with a variety of backing plate and pad combinations, I have concluded that a light weight, 5-inch, flexible backing plate used in conjunction with a 6- to 7-inch pad achieves the best results. Larger backing plates and pads apply too much torque on the motor and rob efficiency. Also, to improve safety (stuff happens!), itÃ¢â‚¬â„¢s best to use a pad that offers .75 inch or more foam clearance beyond the backing plate. "Quote from here good read if ur new to the porter cable:<a href="http://www.autopia-carcare.com/inf-porter-cable-7424-car-polisher.html" target="_blank">http://www.autopia-carcare.com/inf-porter-cable-7424-car-polisher.html</a></blockquote>