the way I learned was just to put the cart in so that the front of the cart scratched the console lip as it went down. It worked 100% of the time.
Yep, that was the most effective method. I found that it also helped to push the cartridge a little bit more forward once it was down in place. Itll only go forward another millimeter or two, but it seemed to make all the difference.
But sometimes it needed some cleaning. The cold air "fwooooooooooosh" blow did nothing. You had to do the hot air "haaaaaaaaaaah" blow in order for it to actually help.
Its amazing how we all came up with the same fixes long before the internet. OTOH, there would be some crazy class action lawsuit about it nowadays.