1. A-Snake is 100% accurate.
2. I believe that there are two reasons why knock-offs are harder to remove after driving:
a. Heat expansion/contraction of the mating metals may cause them to stick to each other.
b. Similar metals under pressure will seize to each other, as well - if your wheels and knock-offs are both made of the same metal (Al), then over time (driving time?) they will get harder to separate (or knock-off). This is why I was informed to use a "dis-similar" metal based lubricant (ie: Copper) on the hub thread and surface where the knock-off touches the wheel.
Here is the lubricant that I use:
http://www.wurthusa.com/project/en/l...th=04.0121.jpg <- I believe it is the CU 1100.
Do we have any "metalurists" to either confirm or deny my simple-ton's understand?