I'm sure the treaded tube over the damper body, supported by a circlip should slide off and allow me to replace the circlip lower down the damper. BUT it doesn't want to move (grrrh!) copious amounts of 'WD40', Halford's 'Shock and Release', and 'Free It'. Dont want to use any heat or use too much force in case I damage the shocker body. Any ideas?