Bob, Yes, I figured out all of that. Where my concern is when you just set it on a flat surface. the tab at the front is 1/4 inch by about 1/8 inch down. The tab in the back is 1/4 inch by about 1/2 inch down so the unit will not sit parallel on a flat surface. As for the extensions I have the original rotomatic. It was made in 1950 at the Overbrook School For the Blind near Philadelphia. It has a two foot extension that fits the click rule so I can go out to six feet with the unit. My rotomatic has three options 1, 2, or 3 feet. ----- Original Message ----- From: "Bob Kennedy" <[email protected]> To: <[email protected]> Sent: Friday, December 25, 2009 12:12 PM Subject: Re: [BlindHandyMan] click rule question
Each of the tabs that stick out are a quarter inch thick. The difference between the first and second tab is 6 inches. When you extend the rule all the way out it is then 12 inches long. For inside measurements, I try to use the tab on the end where the rule comes out. If you put the tab inside the box or what ever you're measuring, remember to add a quarter inch to the final measurement. A little extra you may already know but if not... As you extend the rule, you can count each click, or there are little raised tabs, they look like a thumb nail, on the top side of the rule. Each of those is a half inch. You will want to actually see the mark just beyond the barrel for it to be a half inch. There are 1/16 inch marks along the side of the rule as it comes out as well. You can finger nail these to count just like a Braille ruler. Each of the extensions screw into the end of the next extension with the first going into the end of the rule. The extensions are all a foot long when seated. See if this makes any sense. ----- Original Message ----- From: "Lenny McHugh" <[email protected]> To: "handyman-blind" <[email protected]> Sent: Friday, December 25, 2009 10:49 AM Subject: [BlindHandyMan] click rule question > Hello and Merry Christmas. > I received a click rule for one of my gifts. I don't understand the design > of the tool. Under the knob there is a piece of metal that sticks down > about > a half inch or more. Near the other end there is also a flat piece of > metal > that is about 1/8 inch. Because of the difference it is impossible to set > it > level on a surface. How do you work it for an accurate inside measurement? > --- > Please visit my home page; it is motivational, inspirational and humorous > with many resources for the blind. > http://www.lennymchugh.com > Lenny > Please Copy and Paste into New Message to pass along. 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