QUOTE(CJB @ May 14 2007, 09:31 AM)

aaaaaaaarrrrrrrrrrrrrrrggggggggggghhhhhhhhhhhhhhhhhh
The which way do you swab thing has finally reached this board! Anyone who reads the woodwind.org board will know what I mean! Do a search there and you get so many contractictory statements you won't have a clue what is right.
As long as you unfurl the swab properly before sticking it down the instrument it really doesn't matter. It is equally likely to snag on the register key tube but I agree that unsticking it if it has come from the barrel end is easier as there is more chance of getting hold of it.
Occaisionally pulling a swab through a mouthpiece is fine - the most likely problem is if the metal weight at the end of the swab is uncovered you may scratch something. The material most mouthpieces are made out of is really quite hard, an occaisional swabbing won't be a problem. I prefer to rinse with luke warm water but if needs must the swab goes through.
I'm afraid we'll have to disagree on this one then! I have to say I've yet to experience one jammed due to pulling top to bottom, yet I must've unstuck about 50 or so jammed the other way round (tip: a long, thin crochet hook is a useful tool, but obviously use with care!). Apparently, the register key tube is slightly angled towards the bell (on some instruments at least), increasing the chance of it snagging. My first question when attending woodwind repair workshops is invariably "how do I remove a jammed pullthrough without using a sledgehammer", and the response has always been never to pull through bell to barrel (and to use an appropriate swab of course!).
After my latest mouthpiece purchase, Packer's advised me never to use a pullthrough to clean it as continued use would damage the rails, baffle etc. Whilst Ebonite and crystal mouthpieces have a long lifespan, your average vandoren/selmer plastic one needs loving care to sustain its life. Agreed, occasional swabbing shouldn't cause damage, but it's better to use only the cloth part of the swab to wipe it over.
When all's said and done, any cleaning is good cleaning in some cases. Just casting my mind back to one particularly memorable occasion when, after prising a rather 'ripe' looking reed away from a crusty mouthpiece, something crawled out to meet me...
I hasten to add, the aforementioned mouthpiece was not mine, but a former student's.