Adrian, I don't know if you have a McNaugthan's branch in you area, but if you have, you can ask them to increase the pressure of the gas lifters. If you however bought the lifters from them, they would have increased the pressure FOC.
If you can estimate the weight by lifting the roof by yourself, they might advise what pressure will be required.
You can contact the JHB branch at (011) 334-1630 to find out the closest branch from MP.
Adrian al the new caravans basically has the gaslifters to help push up the roof and then on each end of the roof front and back is a bracket that keep the roof in the open position. There are some small roofs that do not have these extra supports.
However, if the surround (canvas between caravan and roof) is in place, and the gas lifters are pumped to a workable presure the would push against the maximum extention of the surround and this will stabilize the roof in the up position.
So all you need to do is go to midas or a dealer that sell the gaslifters and jack the presure up a little bit. You can get my E-mail adres here on the net and contact me. Got a lot of info you can use to determine the strenth of the gaslifter to use and the correct position/angle to mount the gaslifters.
Trust me if you have this info you will sort your problem in a jiffy.
Good luck with the jobbie.
In the magazine WEG SLEEP from October 2014 is an in depth article with pictures how to replace gas struts.
If you have aproblem with Afrikaans, try the English version of the magazine.
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I bought some of the recommended shocks for the roof from Campworld. Think they cost R120 each. No way could I compress them with bare hands. Needed one end on a brick and most of my weight pushing to compress them, so the ones you have sound very soft.
Hi Somehow I can't upload photos. If you post your cell no I will send photos of how to replace gas struts for a Gypsey Regal. I have just done mine successfully.