Those caliper bolts are interesting and offer 0 torque retention, the clips would hold the bolt if it backed out completely but I'm sure you would notice the bolt coming out before these clips hold it. With the DMC tool it's too easy, I always prefer to work smarter not harder, you don't worry about the twists as it's a manufactured cable and you're guaranteed a a tight tightening feature when routed correctly.
This needs to be replaced asap, both of the rear master cylinder bolts are pulling in a loosening direction - lefty loosey righty tighty
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The wire will hold if bolt looses torque similar to the caliper bolts, but done properly the bolts go across the top into individual holes (red/orange are the 2 wires), they cross to make an X in the center of the bolt, and when exiting the bolt, twist back together and pulls to the left to put force in a tightening direction on the right hand threads.
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I use
Dykem paint pens for torque stripe, to indicate a bolt has been torqued, along with wire if needed. It's a very durable paint that wipes off easily with ipa/alcohol. Torque stripe works well with the rear sprocket nuts for undrilled bolts & studs, it seems these also have a metal locking feature - so double retention here. The stripe would tell you it's backing off before you notice the wire holding it.
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