On bicycles shipped after October 2002" a new sleeve" with an
upstanding key" "K"" is fitted. Two sleeves are supplied with this kit"
one with the key" and one where the upstanding key has been
removed (there is a hole "H" where it was): one or other will be
appropriate for the bike in question. If the bike has a serial number
greater than 0211 011000 (on a label on the back of the frametube in which the seat sleeve is fitted)" then" almost certainly" you
should use the new type (with the upstanding key) as the
replacement.