You mean the type that have multiple sections on the blade that you remove to get a new section. Just hold the "old" section with a pair of pliers slightly above the join and snap it off.
I forgot to mention wolf63, that when you snap the old section off make sure that it's the only one showing at the top of the knife otherwise you'll remove multiple sections.
You have a fourth option, wolf63. Assuming that your bedroom is upstairs, place some scissor-jacks in the room beneath the bedroom and keep on adjusting them until the aforementioned offending bed is on the level:)
stuey - I live in a flat on the top two floors (2nd and 3rd floor) so that is, theoretically, a possible solution.
Alas Frankie is a climber and has killed two clothes horses in the last few years - not too sure if he could resist the scissor thingy. He and his sister are now nine but they can still act like kittens when they need to.
I wish my brother hadn't moved abroad (Engerlund) coz he is good at this type of thing.
My impending repairs to my roof are going to cost me thousands of pounds. That is if we still have the pound up her in Scotland when the bill comes in.
Well then, get rid of the listing bed and sling up two hammocks, make sure yer does it Bristol fashion like, one hammock be fer you and 'tother one be fer the flat-owners: the cats...Cheers, matey.