Painting and Decorating Concourse
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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 rolling pressure. Some poles have one flat edge others like the Wooster Sherlock pole are octagonal on the inner telescoping section.
Paint Extension Poles - part 2
The Sherlock pole is very resistant to bending , which is important with the longer lengths of pole. 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.
The locking device is another thing that you will want to consider when selecting an extension pole. The "twist lock" and the "pin lock" are the two types of locking mechanisms on telescoping poles.
The twist lock comes in two varieties - one which is rare to find now-a-days in which the two sections of pole twist in counter directions to lock and unlock the pole. That is, while twisting the bottom section clock-wise and the top section counter clock-wise and vise versa you will lock and unlock the pole. This type of locking mechanism is the least durable and will wear out sooner than the others. This type of pole is good for light duty poles with occasional use only.
The second type of twist lock is found on the Mr. Longarm poles, and it has a threaded collar that tightens up on the top section using friction to lock it in place. This type is better than the first twist lock but still does not do as good a job as the sure locking pin method.
The pin locks are spring loaded mechanisms that insert a pin into a hole in the top section of pole. This type of lock is far more certain 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 when suddenly your pole gives and twists under pressure - especially problematic if rolling while on a ladder) and more reliable than the twist lock poles.
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