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Hi osu45!
This is just a suggestion so, try getting in contact with:
Titanium Fabrication Corporation USA Headquarters in Fairfield, NJ.
Their telephone # is: 973-227-5300, Fax# 973-227-6541
http://www.tifab.com I used to work for them awhile back...
Ask one of their engineers what they use for fixturing a 120" diameter Ti ring... They just might help your situation.
One last note: Ti-Fab is the largest titanium, zirconium, and tantalum fabricator in the world solely dedicated to reactive metals.
Respectfully,
SSBN727
Run Silent... Run Deep!!!