flex head and gas lens suggestions

Hello,

I currently have a CK-17 torch on my Thermal Arc Tig machine and am considering changing to a 9 flex head. I want to weld titanium bicycle frames and need something that I can get into the tight spaces of a bike. I am wondering if a CK or Weldcraft 9 flex head is the best way to go. Any thoughts?

I am also looking at different gas lenses and cups. I have heard that the Tika lens and cup is the prefered for most high end Titanium bicycle builders, but I am wondering about the Large Diameter Lens from CK

Thanks for any help!

--Matt