Pre-tension (D) of side window inclination

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Ideal adjustment:

Side window glass (1) must run into soft top seal when soft top is closed.

Door window glass (2) must rest firmly on side window seal (3) when soft top is open.

It must be possible to pull out the paper strip with moderate friction resistance.

Fig 1: Identifying Side Window Glass, Door Window Glass And Side Window Seal

Courtesy of BMW OF NORTH AMERICA, INC.

Adjust pre-tension (D) by turning toothed knurled nut (1) on mounting (2) with special tool 51 2 220.

Fig 2: Adjusting Pre-Tension By Turning Toothed Knurled Nut Using Special Tool (51 2 220)

Courtesy of BMW OF NORTH AMERICA, INC.