Money, Money, Chains at one time came with one long u-clip, than some companies used
two small c-clips, than after a number of years a costly tool was required.
The chain Master link when installing must be pressed into the chain outer link ,with a little
penning (mush room over the link shaft arms some),How in the world could this EVER
come loose!!
I worked for a Mercedes Dealer for ten years, No one used that crimp tool.