This exploit is putting tinkers on your gear without actually having them!
I knew about this for a while but wasn't sure if it was on OC, I did check and I couldn't find it. So here it is!
Firstly, this would mainly be used for 70 twinks.
A tinker is used in engineering, at level 70 you can get a maximum of 1 tinker(2 as Gnome).
There are 7 total tinkers and some of them are very overpowered.
These two are the most overpowered & most used.
Tazik Shocker - Spell - World of Warcraft
Synapse Springs - Spell - World of Warcraft
So to get your x1 tinker on Engineering you will need to level all the way up to 450 Engineering, if you don't get tazik/synapse-springs then you cannot get it unless you reset your engineering and start again from 1. This will cost about 8k each time, so this bug is VERY good.
Firstly you will need someone who already have tazik or synapse-springs, once you have a friend with them you want to do a raid or dungeon.
Tazik+Synapse go on gloves, so try get some gloves from the raid/dungeon(pref with gem sockets, since they are most usefull).
Once some gloves have dropped give them to your mate with the tinkers already. open up a trade winder and your mate will want to put the tinker on the gloves and put them into the trade(while he is attaching the tinker) and the twink wants to accept. Now, your friend wants to accept the trade when it is almost complete. Sometimes you can put it on too soon, and the item will become soulbound and you wont be able to trade it anymore! Then you will need to grind more gloves! Sometimes you can put it on too late and the twink will recieve the gloves with no tinker.
The best way to do this is try and accept it when it finishes, if you don't do it right try go even further, it may take a few attempts, I personally got it on my first try.
The way this exploit works is, when a item drops in a dungeon/raid you can trade it for 2 hours to anyone who was in your raid/dungeon.. So as long as you trade it within 2 hours and put the tinker on while trading. It will work fine!
Hope it comes to some help for you people.