The fat part of the spring should be up.

The spring is item 5 on page 3 of the attached pdf.
http://eva2.homeip.net/W115/program/Engine/615/18-005.pdf

Link to the W114/W115 FSM: Mercedes-Benz Model 114/115

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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022