What is the second design B1 then? I spent a bunch of time talking to the local dealership. They have 1 B1 piston type available, so I ordered it. I agree with you, I'd rather adjust it myself. I have 2 pistons with different fixed lengths. the longer one still needs to be 2 - 2.5 mm longer, based on the measurement I made with what I hope is the correct type tool. i made one from a B1 piston cover, welded a M8 x 1.0 nut on it, screwed to resistance, then torqued to 1 Nm.

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'82 300SD - 361K mi - "Blue"

"Good judgement comes from experience. Experience comes from bad judgement."

listen, look, .........and duck.