419-0092 - MK Products 419-0092 Compression Spring 0.32 OD

Keep Your MK Gun Feeding Smoothly

If you run an MK Products gun, like the Cobramatic or Python, you know that smooth wire feeding is the name of the game. These guns are legendary for pushing soft aluminum wire over long distances, but they rely on precise mechanics to do it. One of the smallest but most important parts in that system is the compression spring. The MK Products 419-0092 Compression Spring is the direct replacement for the tensioner in your gun, and it’s the key to keeping your drive rolls gripping that wire without crushing it.

Have you noticed your wire slipping lately? Or maybe you find yourself constantly tightening the tension knob just to get a consistent arc? These are classic signs that your compression spring has worn out. Over time, springs lose their "springiness"—they get compressed and don't bounce back, meaning they can't apply the right amount of pressure anymore. When that happens, your drive rolls slip, your wire stutters, and your welds suffer. Burnbacks and birdnesting become a nightmare. Swapping out that old, tired spring for a fresh 419-0092 is one of the cheapest and easiest ways to tune up your gun and get back to stacking dimes.

This isn't just any spring you can find at the hardware store. It is sized perfectly (0.320" OD) to fit your MK gun's internal mechanism. It’s made from high-quality steel that resists the heat and abuse of a welding shop. Because it's a genuine MK part, you don't have to worry about it being too stiff and deforming your soft aluminum wire, or too weak and letting it slip. It provides the exact factory-spec tension required for the push-pull system to work its magic.

Maintenance is part of the job, and keeping a few of these springs in your toolbox is a smart move for any serious fabricator. Don't let a two-dollar part cost you hours of downtime or ruined contact tips. When you are rebuilding your idler arm or just doing a seasonal service on your equipment, pop in a new 419-0092. It takes seconds to install but makes a world of difference in how your gun feels and performs. Keep your arc smooth and your frustration low with genuine MK replacement parts.