As I haven't got my Sprint 2 yet, I've been studying the manual and noticed that on the A-Arms near where they attach there is a 10mm grub screw that screws through the A-Arm and protudes 2.5mm on the rear, but no mention of how far they protude on the front A-Arms. Can anyone tell me what these are for. It looks like they limit how far down the A-Arms go. TIA