1. Make sure the diameter of the tub or rod is compatible with the diameter of the hose or stopper.
2. If not already fire polished, fire polish the end of the glass to be inserted; let it cool.
3. Lubricate the glass. Water may be sufficient; glycerol is a better lubricant
4. Wear heavy gloves or wrap layers of cloth around the glass and protect the other hand by holding the hose or stopper with a layered cloth pad
5. Hold the glass not more than 2 inches from the end to be inserted
6. Insert the glass with a slight twisting motion, avoiding too much pressure and torque
7. When helpful, use a cork borer as a sleeve for insertion of glass tubes.
8. If appropriate, substitute a piece of metal tubing for glass tubing.
9. Remove stuck tubes by slitting the hose or stopper with a sharp knife.