If, like me, you bought the cheaper jacking point pucks on Amazon and then read about problems with them here's the answer. It appears some people had found that they embed into the jack point and are very difficult to remove.
I first tentatively pushed the puck into place and could see that the locating peg part of the puck was actually a bit too long. It seemed obvious that if used with the full weight of the car it would squash the peg and form a mushroom shape that would cause the problem. I then noticed the the dimension of the peg on the more expensive ones was 0.6 inch whilst I measured the peg on my cheap ones as a full inch. The answer was clear... just saw off half the peg ... half an inch is ample to locate the puck (that thing ain't movin' with the best part of 2 tons pressing down on it!)
I had winter tyres fitted today and the fitter was pleased to make use of my set of jacking pucks on their 4 point lift as they hadn't done an M3 before. No problems occurred.
See truncated puck peg below:
I first tentatively pushed the puck into place and could see that the locating peg part of the puck was actually a bit too long. It seemed obvious that if used with the full weight of the car it would squash the peg and form a mushroom shape that would cause the problem. I then noticed the the dimension of the peg on the more expensive ones was 0.6 inch whilst I measured the peg on my cheap ones as a full inch. The answer was clear... just saw off half the peg ... half an inch is ample to locate the puck (that thing ain't movin' with the best part of 2 tons pressing down on it!)
I had winter tyres fitted today and the fitter was pleased to make use of my set of jacking pucks on their 4 point lift as they hadn't done an M3 before. No problems occurred.
See truncated puck peg below: