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If your Webasto is smoking a lot you need to change this. Pad was a little curved on the edge, but straightend with small hammer. Replacing was a pita, had to cut 3 tig welds around puck with fuel pipe for acess. Groove for circlip holding pad was "dented" to lock clip in place. Afterwards fired right up with only a tiny bit of smoke visible at exhust and no more flame outs.