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This is a common system for mounting modules into a case where the rails that the modules attach to contain channels rather than holes. A number of nuts are inserted into these channels, which can then be slid to any position to accommodate the mounting hole spacing of your modules. In a Eurorack case, these nuts tend to have a 2.5mm or 3mm hole and corresponding thread.

In theory, this is a very flexible system that can accommodate modules that may not follow the most common Doepfer version of the Eurorack standard for mounting hole spacings (Analogue Systems, I’m looking at you) as well as other issues with tolerances in drilling and face place width. Unfortunately, in practice it can be a bit fiddly to align the sliding nuts to the holes, or to make sure you’re spaced out the nuts to match the needs of your latest module re-arrangement.

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