Dali lang ayusiin yan. I can teach you to do it. And give you a caveat as well.
Last time I checked, the minimum charge of Mang Raul for labor is 700. Baka nga mas mataas na ngayon. So if he opens that and puts lighter fluid on the volume pot, and cleans the jack, thats how much he will charge you.
So you decide. Frankly tho, that thing is nothing more than a toy. You should set your sights on upgradiing soon.