most locks dont function unless handle is lifted to lock position,then turn key to lock,and to open,turn key then push handle down,but there is a few that do,so unles you have one that dosnt need an outside handle then its a straight swap for inside handle outside pad but if yours isnt one of these then you would have to change lockstrip.hope this helps
shaun www.sdwupvcrepair.co.uk, January 2009