Installation on a C64C (but not only)

[silverdr]

If you can post a similar picture (or a video ) that will help!
When I feel the motherboard bending... not a good feeling

thanks!

Absolutely. It does require some force but if you feel like it's already too much then you should not go further. If you could send me a private message with a picture of your VIC-II socket on the narrow board that can help.