they make what is called a kwik clip ,made out of heavy sheet steel around 16 gauge or a little heaver ,it's a two piece affair one flat that sits on the top of the leaf and slightly lap's over each side then one about 3/4 inch wide wraps around the bottom like a c shape ,and goes through two slotted holes in the top piece the you clamp the assembly and spring pack with a c-clamp and bend the remaining tab's going through the top over to the outside .they use them at spring shops for quick repairs .i used to buy them from security steel
