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I have read several threads and been to several Tech Days where jacking a Sider from the rear had been discussed. The general conclusion has been to put a piece of wood on the jack pad to keep from ruining the bottom cover on the diff. I didn't pay too much attention until I went to jack up my Spider. With a piece of wood on the jack the entire weight of the car is resting directly on the boss that surrounds the drain plug. That can't be good. Just for grinns I jacked the car and watched the bottom cover. The bottom cover flexed quite a bit with all of that weight on one spot in the center of the aluminum cover.

So I devised this to spread the load. It's a piece of scrap 3/4 plywood and I used a Forstner bit to cut a 1 3/4" dia 1/4" deep relief so the board will not touch the boss around the drain plug. Now the load is spread over the entire cover instead of being concentrated in 1 spot. The additional hole is so I can hang the board on the wall.

 
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