1) The mark you are looking for is inside the distributor. With the "0" mark on the front pulley the rotor must point to cylinder #1 terminal post, else rotate the front pulley 360 degrees further.
2) I had the same question here in Germany for my 420SL (Type 107).
The answer from two older German Mercedes experts is: Only one spring is used in this distributor type.
Best regards,
Michael
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