Agree with that. Fire some grease in there. All Paraboll*cks! is what it is! Hogwash. Std springs in good nick are great. Only problem is 30-40 years later, most are not. Yes if your old springs are shot, fit Parabolox, you'll notice a differnce then, but greased up to the nines, std springs move fine, and work as new again. The ''hard ride problem' is usaully not stiction, but that the spring are too hard. 109s suffer this most. Drive you wagon with half a dozen paving slab in back, and its smoooooth, a Roller driver would be jealous. So unless they're lightr rated, parabollox won't be better than your std spring greased up. Which has damn all to do with any paraboic non stiction claims. And if it puts ride height up, looking good or not, that has to effect handling and braking in an emergency. Maybe enough to make hte differnce between A&E or not. Nope not for me, rather your neck than mine. Conclusion, get the grease out and make them work again, as they would have done 'as designed' when new, as for parabollox... Leave 'em alone. If it was so idiot simple to improve a series with them, LR would have done it in production. The Soilhull engineers were not fools. These springs have come about because of the market for repalcing corroded springs, through "marketing" bumpf, a 'thing' to buy, not through sound engineering....
I use motorcylce chain grease, 'cos it goes in liek WD40 and thing sticks like grease. Lot easier to fit and cheaper. Tenner a can every 3 years?