Apart from rubbing Viagra on them, I'm wondering if anyone with the gas struts and a Zender or Alfa rear wing on their 164 has problems keeping there end up... I mean boot lid up

.
Seriously, I need to know if the struts have possibly worn out and I just need to buy a new set or if I need to find some other solution to keep the boot open. It's a real PITA especially when I use it a lot!
Any comments/suggestions appreciated!
Ta
J