I invested a few hours getting the transmission clean. Here you can see the difference between a DSM and a CSM shift lever the shorter bent one is from a 3G CSM.
To swap them I chose to drill out the pin that holds the level onto the selector shaft. I used a 1/8 bit and went slow; slow drill speed and a good bit. I didn't get a picture of this part sorry.
Once the pin is out you can't reuse it. My plan was to use a bolt. What I did was tap the lever with a M6x1 threads, (the same ones thread most of the small bolts use that are found in these cars).
Starting from the top of the pin hole on the lever, I threaded it through until the tap was in the center but I did not continue all the way through. This is it because my cheap taps aren't long enough. Then I put the lever selector on to the shaft and ran the tap through it. This must be done with the lever on the shaft so that the threads line up.
Once the threads where started on the shaft I took off the lever and tapped the shaft itself.
If you have a long M6x1 tap then its not a problem.
As I said I did not run the tap on the bottom end of the shift lever pin hole. What I did was to grind down the threads on the end of the bolt just enough so that the bolt would fit tight into this bottom end of the pin hole. Sorry, its hard to explain....
Ready for installation.
I don't like to press these up and into position myself . This is easier for, but it takes longer. I use a jack when I need to adjust the length of one of the two straps.