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I always use wood blocks on my jack and jack stands. I have an old oak 2x4 that I picked up and cut in into several blocks. It is tough enough that it won't crack in half (like a piece of pine), but it won't hurt any metal jack points.
Do you place the jack stands with the wood block under the jack point with the seam (ridge)? And if you do, did you cut out a slit in the wood block so it would fit over the seam and touch the flat areas like the hockey puck?