Ha. With lots of patience. First you have to find the bottle. They were expensive back in 78. Then you go to your local head shop and buy the down tube, collar and bowl so you can cut the tube length to correct size. Then you go to the campus police and ask to borrow the engraving pen so you can mark your valuable property with an identification number. Go to the parking lot and scoop up enough sand to fill the bottle then fill the bottle with the sand. Bring it back to your room and place is laying down but partially tilted up on the floor with a pillow under it. Then you take the engraving pen and start chipping away at the glass between the bottom of the swirl and the top of the basket like where the label is. Just go round and round and round and round round and round and round and round round and round and round and round round and round and round and round for hours and hours and hours long hours and hours and hours long for 3-4 days. Eventually after driving everyone nuts with the sound you have been making, a round hole in the glass to fit the down tube magickly appears in the glass that fits the down tube. If it doesn't fit just go round and round and round some more. If you made it this far with out the bottle breaking you are home free. There was no carb hole, you had to pull the down tube for that. Then bring the engraving pen back to the keystones and act like the tip of the carbide pen is not completely destroyed when you return it. Ignorance is bliss. Make sure you get everyone that you pissed of making the noise good and stoned to make up for it. Watch out for clumsy stoners. They have a habit of breaking things. Not on purpose, just not paying attention and shit happens. The hit took 2 full lung draws. The first was to burn the dope which would fill the swirl to the top with smoke, then exhale, pull the tube, then inhale the smoke. They called me fire breather. The things we did instead of studying was incredible. It didn't matter, the classes were way to easy to need to pay attention. Any way that is how I made a bong out of a bottle like that.