How to resize

Hi, Newbie question. I’ve tried resizing the pipe with the scale 1D tool, but it never turns out right, it always extends it and doesn’t shorten it. Very frustrating. I need it shortened by 12.121mm. Please help! Thanks, Susan

forgot file. here it is:hawk for bracelet.3dm (3.3 MB)

If you type in “12.121” into the Scale1D prompt it interprets that as a scaling factor.
Try instead to set up construction points as starting and ending references:

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Move the end face by the required distance with MoveFace