Jacobs Rubberflex end-stop CP917/918

Description

this rubber thing is used with Jacobs rubberflex collets when you are holding some thing short so the back of the collet doesn't close more and cause the collet to eject what you are holding.  the smaller size is used with the 7/8-1" collet, the larger size is used with the 1 to 1-1/8" collet.  no evidence of use.
the rubberflex manual here explains about these supports: http://www.neme-s.org/images/Jacobs_Collet_Chuck/Jacobs_Rubber_Collet_Chuck.pdf
note to me: box 7
I normally ship within 24 hours of your order, but the post office does not always initiate tracking when I put the packages in the drop off box.
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