Hey so I am fairly new to doing my own internal work on airsoft guns and was going to maybe be getting a VFC gun to maybe do a little work on. I have heard that VFC internals are known for their self shimming gears but a lot of people don't like them. Why? I as a beginner in internal work think that this is a good thing considering from what I've heard that shimming gears is one of the hardest things to do in an airsoft gun. What is the whole point of self shimming gears? And how do they actually "self shim"? Would this be ok for a beginner in internal work?