Tony, the silver is just a factory Yamaha secondary spring. The heel clicker has an adjustment point in the "heel" of the weight, then one in the middle and one on the tip of the weight where you can add or remove fasteners. The 8BU's are also a nice weight and work well, I just hated pounding rivets in and out to make adjustments to the weights! The 45-41 Advant-Edge helix will shift like a 49/45 or a 50/45 when comparing it to a Micro Belmont, Maxx Perf, Bender, Dalton, etc. Let me do some digging through the shop bins. I know I have some heel clicker sets around yet that I'll let go cheap.