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Haha, sorry to hear about your short legs. I was utterly confused this morning as my knees kept complaining that the saddle was too low, despite me raising the telescopic bit at every set of lights. I'm ashamed to say it took me 9 miles to realise the outer bit was slowly sinking...
TurtleRecall-
Mine doesn't sink, but it does occasionally rotate if I go over cobbled speed bumps with enthusiasm. Unfortunately it's at the end of the thread on the homebrew QR clamp, so I need to extend the thread by a turn or two. It's been on my Things To Do list for at least a year now. There's a decent chance it'll still be there in a year's time, along with making an end stop for the seat post. As the old saying goes, if it's only a bit broken, don't fix it.
Anyway, short legs aren't all bad. They're handy on aeroplanes.
Brommers
One day I'll actually work out what the optimum height is for my Brompfication titanium post (it doesn't have the flared end like the real Brompton one so it has no end stop), chop it to the right length and make up a stop for the end of the seat post. It's been something I've been meaning to do for a long, long time and never got round to. The lack of an end stop means I do occasionally unfold the bike, hop on, and then wince as I discover the saddle's about 2 inches higher than it should be. The curse of short legs...