In the process of removing head, the shop manual ('86 year, 103 engine) says to set crankshaft to ignition TDC and shows a picture with a numbered cylindrical setting dealy

Either I'm blind or they changed the later 103's to set to TDC some other way, because I can't find this setting anywhere.

If it's not been changed on any 103's, then where should I be looking for this area? It could be that oil is covering the spool but I don't think that's the case.

TIA

~Paul

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'91 300E, 206k miles