6mm = 1/4
A quick search found me this:
http://www.ebay.co.uk/itm/BLACK-6MM-PIN ... 3cba221448
less than a fiver, just peel off what's there, as you're applying the new stuff. That way you don't have to try and re-measure and re-create the lines. Looks like they had greasy hands when applying the tape, seeing as it's on the corners where they would have had to handle it more, which stopped it from sticking.
Of course, from the great advise given so far by Nige and Neil... use the tape lines that are there, to create an outline of the pinstripe that is falling off, peel off the falling off pinstripes, scuff, degrease and paint. Aerosol will work, if you can go with some 2k paint even better.
Or as Chevy Stu says, go back and get them to do the job you paid them to do
You've got options for sure
The rest of it came out looking great! Looks very good
_________________
How to post pics: When writing a message, scroll down and use the "attach file" option. Where possible, a photo sharing service can be used such as Flickr, Imgur etc. The image location (usually ending in .jpg) can be copy and pasted between the ][ brackets that appear when you click the 'Img' button (you can find this button at the top of the message box).
How to post youtube vids: Click on the 'youtubeHD' button at the top of the message box and in the middle of the ][ brackets that just appeared, copy and paste everything from the youtube web address that appears after the = sign i.e if this is the url:
https://www.youtube.com/watch?v=K2cNqaPSHv0 just copy "K2cNqaPSHv0").