Thanks for the info so far...
OK, so the top's only going about 2/3 of the way up, it's not 'just the final inch' problem.. Met a mechanic in Scotland in the summer who gave me some grease that I covered the rails with.. still no joy..
What's happening is, it's making a noise as the top goes up, then it gets so far and makes a noise like it's missing something as the cog tries to turn.. if that makes sense?
It's doing the 'click, click, click' without actually catching and going anywhere...
And the top's not getting anywhere near as far up as it did when I first got it just a year ago..
Help?
Thanks
