Insert New Grease Cartridge and Prime

What happens here

Take a new grease cartridge. Before inserting it, remove the plastic cap from one end and the foil seal from the other end. Be careful not to puncture the foil seal prematurely before it is completely removed. Once unsealed, drop the new cartridge into the grease gun barrel, ensuring the open end faces the head assembly. Screw the barrel back onto the head of the grease gun until it is finger-tight. Finally, release the plunger rod from its locked position and push it inward firmly to ensure it makes contact with the grease and primes the gun for use.

Goal: Load the grease gun with a new cartridge and prepare it for use