No, you cannot refill a cream charger. Here's why:

• Safety Hazard: Cream chargers are designed for single-use only. They are built to withstand a specific internal pressure created by the nitrous oxide gas. Refilling can damage the charger and potentially cause it to explode, leading to serious injuries.
• Material Design: Cream chargers are typically made of thin metal that can be easily weakened during the refilling process, increasing the risk of rupture.
• Ineffectiveness:Even if you could refill a charger safely, the refilling process itself is quite impractical and wouldn't guarantee proper pressurization for whipping cream.

Cream chargers are single-use canisters designed to withstand a specific pressure from the nitrous oxide gas. Refilling them can damage the metal structure, creating a weak point that could lead to an explosion. This explosion could cause serious injuries to yourself or others nearby. Refilling attempts might result in an uncontrolled release of the gas. Nitrous oxide can displace oxygen and cause suffocation in enclosed spaces. Always opt for using new, commercially available cream chargers for safe and reliable whipped cream creation.