Piano desk kit

Hello, was looking to add a desk kit to the upright piano that I just got that doesn't have one. Question how would I go about adding center support for it? Thanks kindly

Maybe this could be of help:

http://www.balaams-ass.com/desk.htm

There is nothing on that page that a local piano technician could not get for you, and it might be better to have someone who looks at the piano advise you. Keep in mind that finishing a music desk properly is difficult.