Yeah, I noticed that pilot thing could go right in the compressor. Why do you feel it is necessary? To seal the inner side of that tube? In fact, it fell in compressor as we were trying to figure out the assembly. I just stuck in the suction hose and hoped for the best . Since the previous one did not get sucked in the compressor,i figured it would be ok.

Thanks, i'll give another go on the seals and post back.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius