700N for non-lifting panel, 1000N for lifting. Schleicher part is made by Hahn Gasfeder.

Unscrewing front and is good advice, but some gas struts have stamped end that cannot by unscrewed. Opening nose bolt is relatively easy, but putting it back is more difficult. I did this by supergluing nut to my finger and reaching it to bolt end (yes, lost finger skin in the process). It took one day instead of 60 minutes and I invented a whole new vocabulary of curses. Seriously thought of sawing the nose cone off to attach bolt.