I wouldn't go with the glass jars just in case you fuck up.
take high grade coke mix with a water and baking soda. Definately more coke than baking soda, but your mix will depend on the grade of coke. Mix it in a large spoon. Make a poker out of a coat hanger. For best results use a low grade steel without any coating. heat this mix over a gas stove very lightly. Dont burn it. Do this by touching the spoon to the flame, remove from flame, repeat.
Have a ice cube ready sitting towel. When you remove your mix from heating set the spoon on the ice cube. Take you poker and start to stir the mix. You will have a bogger forming. keep stiring and the bogger gets bigger. Try not to make contact with the poker to the sides of the spoon. Take you bogger and lay it out on a nice clean glass surface or load it right to the pipe, and let it dry. Repeating this proccess again you may be able to pull out more crack if there is some left in the water.
smoking, well get the choreboy the copper stuff. heat the piss out of this over the gas stove. always better with more heat. Just like preping a screen. cut it and load it in your pipe.
The rose pipes found in convenient stores suck. They can form very tiny cracks from heat. They will steal your hit. Nothing is worse when you load a gigantic bell ringer hark the hearald angels sing hit, and you dont get shit cuz you failed to see this tiny microscopic crack.
Tire gauges work well. Remove the guts and there is you pipe. They will not crack although they can fail from heat fatigue. Your smoking too much if you need a replacement.
Pyrex is probobly the best.
After a few hits take your poker and force the choreboy to the other side and then back and repeat, repeat, repeat on a cold pipe. The crack sticks to the sides. the choreboy scrapes it off. fire it up and wow. That was in the pipe?
Enjoy and be safe. Rember what your dealing with CRACK. Yes its dangorous and highly addictive. Know your limits and stick to your guide lines. You will never match the feeling or intensity of the first hit of the night. Dont try to be stupid and try to get that feeling again.
Since this is such a touchy subject I would just like to add. I hate snorting coke, but hearing those church bells ring is an amazing thing.