Welcome to the forum 
I hope you post your finished design when it’s done! That zinnia is mesmerizing to look at.
@hastypete hasn’t been on the forum for a while so hopefully he’ll either see the tag, or see your post on YouTube. If not, if you can tell us what the spring calls for there are lots of very experienced makers on here that may be able to point you to a good spring source.
The plans come with notes
From the notes:
1 – Neg’ator Spring part # A 3x51-20006 www.sdp-si.com
6 – Standard R6-ZZ Bearings, 7/8”OD x 3/8”ID, ¼” deep . or Part # 6384K23 or
equivalent www.mcmaster.com (approx. metric equivalent 22mmOD x 10mmID, 6mm
deep. Part # 5972K286)
Let me know if you need tips on modifying the dxf for the glowforge. I can’t send you my files due to the oritginal copyright, but I may be able to send some screen shots of what I did.
Thank you so much for the information. I really appreciate it.
Have a wonderful day