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		| Originally posted by Badger05 I don't think that is a very good idea.  What makes you think that the yard lines that you used to mark the chains with tape were accurate?  I have worked on many fields with "wavy" yard lines that are not accurately laid out.  Last season we changed ends at the end of the first quarter, 2nd and 9 from the 10 yardline.  When we got to the other end of the field the LTG was in the endzone by about 2 inches.  What a fun night.
 
 When I place the tape I do it by holding both posts together and pulling the chain out from there.  I have seen linesmem that place the tape by the yardline.
 
 We only use it as a visual reference.  All penalties should still be marked off on the field, not with the chains.  But I do think that one mechanics manual describes this mechanic.
 
 [Edited by Badger05 on Dec 13th, 2005 at 03:56 PM]
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 Personally, I don't care if the lines are accurate.  We had a touchback this past season and a run came up about 3 inches short of the 30.  I refused to measure.  I am not awarding a first down short of the 30 after a touchback, even if it is mis-marked by a bit.