Toilet flange shim ? Home › Forums › Archives › Old Bulletin Board Archives › Toilet flange shim ? This topic has 0 replies, 1 voice, and was last updated 23 years, 4 months ago by Michael Coulson. Viewing 0 reply threads Author Posts 27 Oct 1997 at 9:12 am #281938 Michael Coulson Does anyone know the origin of the old trick of shimming a toilet flange ? is there any documented source for this trick? Author Posts Viewing 0 reply threads The forum ‘Old Bulletin Board Archives’ is closed to new topics and replies.