Cleaning upper manual key contacts

During my experience cleaning the contacts of the lower manual, I learned cleaning the contacts has to be done very thorough, to have a good result.

Therefore I decided to remove all of the plastic spring guides, so I could reach the bus bars and the springs very well for cleaning. In the first picture you can see the key contact print with the plastic spring guides removed.

For cleaning I scratched the bus bars and the springs with a small flat screw driver. It takes a lot of hours scratching every spring a few times and the bus bars on every spot where the springs are supposed to make contact.

Now the hardest part; getting the plastic spring guides back in. It is very time consuming to say the least if you have to do it without an aid. I gave it some thought and put threads in the springs to make them longer. Then it is easier to guide the springs into the holes. After you have put the plastic spring guides in, you take the threads back out.

Here you can see how is necessary to make the springs longer, to guide them in the holes.