There is a boy named Mr Raja, in Melody Market. He does not have a shop and is a free lancer. You can find him in the area around the workshops in Melody Market. He has a lot of customers and usually operates on prior appointments. He will charge around Rs 2000, but is an excellent worker.
Another source is a worker who works at Heera Brothers in Bao Mahalla Saddar, Rawalpindi.
I think Mr Raja is a better option.