After trying several suggested ways of refitting the spring mechanism without success, I had a brain wave and came up with my own method which worked well. I thought sharing it on your website will help other people fitting GTS mirrors.
C-CLAMP METHOD FOR REASSEMBLING GTS AERO MIRRORS (WITH PIC'S, see below).
The spring mechanism that holds the mirror housing to the base on 928 door mirrors is super strong and not easy to reassemble. After trying all of the suggested methods on the 928 forums without success and not having anyone else around to help me, I came up with my own method to do this task alone that worked well, so sharing it here to help other people.
1) TOOLS REQUIRED: 6" C-CLAMP. 19 MM SPANNER. LONG 17MM SOCKET. HEXAGON INSERTION TOOL FOR SPRING MECHANISM. MASKING TAPE. SOFT TOWEL AND PILLOW. STANDARD ASSEMBLY GREASE.
2) On your soft towel, first grease inside the mirror base and inside the mirror housing where the spring mechanism inserts and the 3-splined ends of the bolt that hold the mirror to the base, turn and lock into place. Loosely assemble the Aero mirror and insert the spring mechanism into the base, rotating it until the 3 splined ends slot into the cut-outs in the mirror base.
3) Insert the hex-head tool into the spring mechanism and attach the 17mm long socket.
4) Get your C-clamp. Attach the top end of the c-clamp inside the mirror and the other end to the bottom of the long 17mm socket.
5) Put some masking tape over the aero mirror where the c-clamp passes across the out-casing of the mirror casing.
6) Adjust/tighten the c-clamp so that it will hold the 17mm socket safely without being loose/falling out.
7) Make sure your spring mechanism is aligned properly and begin tightening the spring mechanism inwards by winding the c-clamp tight.
8) Make sure the c-clamp does not slip off the socket end using your hand to hold it in line whilst tightening it inwards.
9) Keep looking inside the mirror housing to see when the 3 splined end of the bolt inside the spring pushes up far enough to be locked into place.
10) When the 3 splined ends have come up far enough under the pressure from the c-clamp get your 19mm spanner.
11) Now using the large end of the hex-head attachment, slowly turn the 19mm spanner anti-clockwise until you feel the 3 splined ends of the bolt inside the spring lock into place.
12) HOORAY! A difficult Job done!
best to all 928 owners, Dave.
