I would like to show you below some of the side effects of not using the factory feet, beside stability issues:
The wood panels are scratched and chipped at the bottom.
With help form a friend from United States that is supporting me with parts or equipment hard to find in my area, I was able to find a complete set of feet, you can see below:
At the end my Teac A-3440 looks like below:
One of my next tasks will be to repair the power cord strain relief, the present one doesn't look to good, and I will do it as soon as I will be able to find the original.