David - One comment from someone that has never replaced a Cobra strut (but might have to someday).

Please take lots of pictures of your replacement process and publish them for the benefit of all. Also publish a list of resources and data you found and used. Years ago I did this for installing Wederkind sleeves on L'hotellier fittings and I still get a thank you note from time to time.

Ditto message to anyone replacing internal struts.

Thanks, John OHM Ω