Just an update, it has been a week since I rebuilt the armrest, it is strong and holds up well, maybe it's still too early to tell.

All it took me were 7$ for the glue and cable ties and a couple of hours.

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99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.