The Plug Cap Spring is a vital genuine Stihl component designed for the ignition system of various Stihl machines, including the TS410 and TS420 disc cutters. Crafted from durable metal, this small yet essential part ensures a secure electrical connection within the spark plug cap, facilitating reliable starting and optimal engine performance. By maintaining a firm connection to the spark plug terminal, the Plug Cap Spring plays a crucial role in the smooth operation of your Stihl equipment, making it an indispensable addition for maintaining your machine's efficiency.