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Re: R3 20" rule
The technique I saw being used for checking this at the LaCrosse WI week 0 event may be helpful.
Hold a plumb bob* so that it touches the furthest reaching (or suspect) point of the extension. If the horizontal distance from the string to the frame perimeter (where the bumpers attach) is > 20" you have a problem.
The plumb bob is also useful to assure that the starting configuration is legal and that everything is inside the frame perimeter
* a free hanging weight attached to a string to produce a vertical line
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John Vriezen
FRC, Mentor, Inspector #3184 2016- #4859 2015, #2530 2010-2014 FTC Mentor, Inspector #7152 2013-14
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