If you are using shorter pole lengths, the round poles are cheaper and should work just fine. When you get to the 8' - 16' or 8' - 32' poles you will probably want to use the stronger poles.
Locking Mechanism
The locking mechanism is an important element that you will want to consider when selecting an extension pole.
The locking mechanism is usually what breaks first on most poles. There are two types of locking devices used with telescoping poles: the twist-lock and the pin-lock.
The second type of twist-lock is found on Mr. Longarm poles also. It has a threaded collar that tightens up on the top section, using friction to lock it in place. While better, in my opinion, than the counter-twist lock, it is still not as good as the pin-lock.
Pin Lock
The pin-lock is a spring-loaded mechanism that inserts a pin into a hole in the top section of pole. This type of lock is far more dependable and lasts longer that either of the twist lock types. You will not get any twisting when applying roller pressure with the pin-lock poles, which is safer (you can lose your balance if your pole suddenly gives out and twists under pressure, which can be especially problematic if rolling while on a ladder) and more reliable than the twist-lock poles.
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The shape of the extension pole used to be round until someone figured out that if the pole had flat edges to it, it would be stronger and less likely to bend under pressure. Some poles have one flat edge, while others, like the Wooster Sherlock pole, are octagonal on the inner telescoping section. The Sherlock pole is very resistant to bending, which is important with the longer lengths of pole.
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Twist lock
The twist lock comes in two varieties, one of which is somewhat rare and hard to find these days. The first type - "the counter twist" type, where two sections of pole twist in opposite directions to lock and unlock the pole.
The counter-twist type works by twisting the bottom section clockwise and the top section counter-clockwise and vice-versa to lock and unlock the pole. This type of locking mechanism is probably the least durable and will wear out sooner than the others. I would consider a pole with this type of locking device to be for light, occasional duty only.
Painting Extension Poles
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Painting Extension Poles - part 2
Painting and Decorating Concourse