progress is slow. So far I am on my third spring manufacturer trying to find the right price or simply get an answer. Biggest problem is these companies are slow to respond and horrible in returning calls. First company after delivering samples and going thru quite a bit of discussion fell off the face of the earth. Second company after a couple months of badgering offered pricing that was sky high. The third company I am currently working with went for weeks without returning my calls. Last Friday I talked to a different salesman there who promised to call me today with pricing. Not holding my breath for too long before I go looking elsewhere.