I bought this pump kit to repair my old Coleman stove (Model 413), whose pump went bad. The kit can repair older stoves (with metal pump cap) or newer ones (with plastic cap), but comes configured for the newer stoves. To convert it for older stoves, you have to remove a spring clip beneath the rubber plunger. This allows you to slide the parts off the shaft and replace the plastic cap with a metal one and coil spring (included). Removal of the spring clip requires a good pair of needle-nosed pliers and some care to avoid damage to the plunger. Once the clip is off, re-assembly is simple. A new spring clip is included in the kit, which is good, because you'll probably bend the original one beyond reuse. If you have a newer stove, you can throw away the conversion parts and use the pump as packaged.