Okay.
Settle in. You may be here for a while. You may as well get a glass or bottle of your favorite beverage to enjoy.
Hmmm.
I have had simwithdrawal for a while. I Broke my T16000m back in the end of may and having had to prioritize other things afterwards.
I have only now found the time for repairing it and have just finished it. I am very happy!
It took me several hours over 2 days.
The cap for the center 5 way switch fell off.
Note to self. Do not try to move any DIY controllers around by grabbing a glued on button.
In trying to put it back on with CA glue, I failed to turn it upside down, so glue got into the switch.
Note to self! Whenever you are using easy flowing glues, turn the objects so it flows away from moving parts!
Back and Center Push was stuck. I managed to loosen the back push, but when pressing center very hard, all 4 direction switches would activate and still no reaction from the center switch.
Time for a replacement.
That went fairly well but there where a couple of snags.
Another note to self! Hotglue is great for keeping stuff in place, but can be a pain when you need to remove it again!
One more note to self! Always be careful with a knife! It can cut you up faster than you can blink when it slips! That ¤%&/&(/ hotglue!
I misaligned the switch so I had to cut it out again.
More note to self! There is a high chance of ruining electronic components when trying to install them with hotglue multiple times or using to much at the wrong place! It still works but 2 of the buttons have a lessened clicky feel.
Fire up the PC and test if it works. Yes it did.
Carefully glue the button top to the switch and let the glue settle.
Test again. Succes!
Time for assembly.
I couldn’t remember how to route the cabling inside so I fiddled with that for more than an hour. Then I discovered that one of the wires soldered to the switch points on the PCB had snapped. Oh well, soldered back on.
More fiddling including screwdrivers to push wires away from the bodyjoints.
Ahh! Finally assembled! Another test and then slip the piece with the center 5 way into place (That piece was the center switch before the modding.) and test.
What! No!
Whenever the center press on the new 5 way was activated, button 1 would activate. Carefully prying out the piece and push the wires in the hole around. Okay, now it works so slip it in again.
Blargh! 1 is still activating.
Okay disassemble again.
Turns out that 2 wires connected to one of the ground pins on button 1 where frayed. When the 5 way piece was pushed down, they would rub against one of the live pins and thereby short the switch.
The PCB with button 1 pins (white) and snappy wire (red)
I found the main ground connection on the PCB and after burning of the lacquer I soldered on a wire and connected that to the repaired wires instead.
The wire have snapped of from the switch point again.
Test.
More assembly wire fiddling.
There are 23 wires in the handle and not much space for them to fit into. 11 for the original buttons and the twist pot plus the 12 I added for the mod.
Ohh great. That wire have snapped again. Now it is very short.
Self Note! When using hotglue on contact points, don’t use to much as you may need to get it off for repairs.
Test.
Fiddly assembly.
Test.
Slip 5 way piece in.
Test.
Succes!
Time spent. Between 8 to 10 hours over 2 days, most of it spent on assembly fiddling. Those wires just seem to love being snagged between the grip halves.
Sorry, due to frustrations I have not taken any pictures of the repairs. At times I was ready to hurl everything into the wall and attack it with a hammer. Hey! I meant the stick! Not the Wall! 
I am happy and relieved that I have it up and running again.
Happy Simming