Hi everyone, I grew up on an Iowa farm and wasn't uncommon to change two cartridges/tubes a day during Spring and Harvest time. Every suggestion so far has been right on target. My dad (full-time farmer) showed me those same tricks. Here are some additional items, after you lock the handle, swap the tube, pop the top, there is usually some grease on that "pop-top", scrap that grease onto the top of the newly inserted tube. This adds/saves some grease, but also eliminates some of that air that would later have to be purged from the gun. Next, screw on the top at least a couple full rotations(just not tight, as previous mentioned), release plunger t-handle, put grease nozzle into trash can or walk over to ditch and pump the handle like crazy for 15 seconds. If purged, tighten the barrel; If not, rotate barrel 1/2 turn (either way), also use T-handle in two different ways. 1= if t-handle is loose from bottom disc inside barrel, just move it in and out a few times and then pump like crazy for 15 seconds. Last resort #2 = Pull T-handle out and rotate it to lock onto that internal, spring-loaded disc at the bottom of the grease tube. Once locked, put T-handle on your belly button, one hand on the barrel, one hand on the lever, pull grease gun/lever towards your belly with full force and pump like crazy!!! Most times it only takes 15-30 seconds, But I have had those problems that have taken 3-5 minutes to purge a new tube in a grease gun, but we always were succesful in the long run. Good Luck
