Found this item online and bought a few of the 0.5gram model for a try.
These racquet weights are made from silicon with adhesive backing. Thus just peel and apply to the prefer position on the racquet frame.
PRO: Seems to do the job and adds just a tad more weight to the desired position on the racquet.
CON: Can be a tad troublesome to apply onto a strung racquet
These weight for the frame does offer to help add weight to your racquet, if you prefer a racquet with just a tad more head heaviness than what you can find in the shops. The silicon has not fallen off after a few weeks usage ... yet.