What is the full function of the 75-066 roller?

A home owner from williamsville, ny 14221 says:
June 1, 2011
The 75-066 screening tool design shows one sides diameter larger than the other. what is the purpose and what exactly is the full function of this tool?
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Dave Sr. from SWISCO responded:
June 2, 2011
I have personally never used the 75-066 style roller. I like to use the more common ones like the 75-008 and 75-019 for example. I believe the step in it possibly smooths out the wrinkles in the screening as you install the new screen mesh. Some installers swear by it. I am going to contact the manufacturer and see what else I can find out. I will respond back here when I learn more.
A home owner from Willliamsville,NY 14221 says:
June 23, 2011
Dave,

I posted on 6-1-11 regarding item #75-066, screening tool. You weren't sure of why one side of the roller was larger in diameter than the other and what was the full function of this item. You were to contact the manufacture and get back to me and never did.

Please obtain the information and let me know the results. Thanks
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Dave Sr. from SWISCO responded:
June 23, 2011
Although I haven't heard directly from the manufacturer, I have spoken to a few window repair men about the design. Most believe it is designed this way in order to take out the wrinkle effect of the aluminum screen wire during installation. When you screen in the wire you get a slight wrinkle effect, but this design helps remove the wrinkles in the spline with the roller rather than having to smooth it out with your hand.
A home owner from Willliamsville,NY 14221 says:
June 24, 2011
Thank you for the time you put in to get me an answer.
Professional Step Roll Screening Tool
Professional Step Roll Screening Tool
75-066
$29.74
Rolling Tool, Convex and Concave Rollers
Rolling Tool, Convex and Concave Rollers
75-019
$12.44
Professional Screen Installation Tool
Professional Screen Installation Tool
75-008
$52.74
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