About the saddle intonation springs...

These small springs are slid over the intonation screws before you insert the intonation screws through the 6 holes in the back of the System I body just under the fine tuners. They provide "pull back" tension needed when dragging the saddle to its intoned sweet spot. Many guitarist remove them over time as they are kind of a hassle until you drag it, then you wish you had it. Oversized for better pull, these 6 springs are the ticket. $5.00 set of 6.