If anyone is interested, I have my answer from Dingwall tech:Does anyone here know why the tool kit for combustions for sale on the Dingwall Store site has 4 wrenches instead of the 3 my Nolly came with? The larger of the two black ones did not come with my original tool kit. I wonder if something was modded later on that required a fourth, or did they just not have them at the time my bass was shipped? Inquiring minds want to know.
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"The picture that was used on our store site shows a wrench that is no longer used. The fourth wrench that is shown is used for string height and intonation adjustments on older model Combustions and NGs with a different design of bridge."
Mystery solved.