The drop-down bed on my Galaxy A-class, an elderly 1997 model, is dropping down rather too readily! It's time for some new gas struts I guess, before I do myself a mischief trying to put the thing back up un-aided. Has anyone got tips or the benefit of experience in sourcing the right struts at a sensible price and replacing them. I have forbodings of this being a tricky job. Please someone, tell me I'm wrong!