Hello there!
There's an exploit going around that allows you to apply tinkers to other people's gear through the trade window. Now that's old news.
The new exploit, is that you can apply Incendiary Fireworks Launcher - Spell - World of Warcraft
Most of the other tinkers state "Requires xxx Engineering to use/remain active". This one however, doesn't!
I'm not sure if it requires any engineering level above 1 at all, I've only tested this on a 72 with 450 engineering.
It is still subject to enchant-scaling, but compared to other tinkers, it's still overpowered.
(Yes these are placeholder gloves untill I get the right ones to drop.)
It was done using this method: http://www.ownedcore.com/forums/worl...-lvl-70-a.html (Every Gloves Tinker on lvl 70)
Enjoy!