This product description should have provided some insight on how to use this counterweight...from coastaltool.com:
This article covers the following Porter-Cable tools:
The 7335 5" & 7336 6" Random Orbit Sanders (along with the sander kits we sell, 97355 & 97366 respectively), and the 7424 Car Polisher.
The counterweight is a half-moon shaped piece of metal attached to the rotating shaft of the tool. This smooths out the random orbit action by providing a counter balance to the elliptical orbit of the rotating backing pad. If you change the pad size you must also change the counterweight or suffer unnecessary vibration and possible damage to the tool.
There are two different counter-weights which are clearly marked to indicate use with either the 5" or 6" backing pad. Therefore if you decide to outfit the 7335 5" Sander with a 6" backing pad for sanding or polishing you must switch to the counterweight used with 6" backing pads. The same goes for the 7336 6" Sander. If you decide to outfit it for 5" sanding or polishing you must switch to the counterweight used with 5" backing pads.
The only exception is when using the 54745 6" Foam Polishing Pad. Due to its light weight and the small-diameter backing pad used (included with pad), it can be used with the 5" or 6" pad counterweight. Porter-Cable outfits the 7424 Car Polisher with the 5" pad counterweight.
Get more detail about Counterweight for Porter Cable 7424 Polisher.
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