Petrof key action, how to make Petrof key action heavier

[locson]

I own a Petrof Grand, 6'4" for over a year, made in 1999. I bought it for my kids, but I play piano Classical too, and I even teach all my kids Classical piano until they reach imtermediate level. I was happy with it 100%, even I am Steinway fan, since I got this piano with a good deal (US$11k), and I cannot affort a Steinway. But recently I have some issue that I would like someone can help me with.

One of my kid is very talented, he is only 10 years old, but working at advance level. He really want to go to piano competition. But most piano competitions in Southern California use Steinway or other American made piano, with heavy action (my son's teacher also has Mason, she is a piano's prof and also a pianist). My son's teacher said to me that my light action piano may  effect his performance, since he may play very good at home, but cannot play as good when with his teacher's piano, and he may have the same problem when he is on stage.

Do anyone know a way to make the Petrof action key mor like the Steinway? I talked with my piano tunner, and he recommend me to add weight to the keyboard (the going up side of the keyboard as in the image here), but I do not know if that is the best way or not?

Thank you

[hfmadopter]

That's what I did with my old Henry F Miller years ago to more match my teachers Steinway. The Miller keys were quite light. I've since lightened them about half as much as I weighted them, so they are in between where it was before any weight was added and where I weighted them to back then. Getting there is another matter ! Are you having the tuner do the job or were you thinking of doing this yourself ?