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==== Panel mounting holes ====
If the Doepfer specification is followed, or rails with sliding nuts are used, elongated holes are not required. These are useful for non-standard panel widths like the Piston Honda's and to compensate for for manufacturing tolerances of the panel width or hole position. They help to fit the modules flush against one another.<ref name="oval">[http://www.muffwiggler.com/forum/viewtopic.php?t=126980 Euro modules – Oval mounting holes], Muff Wiggler forum, December 2014</ref> In a double width case, there will be a gap where the two threaded inserts meet, unless e.g. single 168 HP tiptop Z rails are used.<ref>[http://www.muffwiggler.com/forum/viewtopic.php?t=69180 The Eurorack Charter?], Muff Wiggler forum, October 2012</ref>
Oval holes were originally for mixed Analogue Systems and Doepfer systems. The AS holes are 0.2" from the panel edge and the Doepfer holes are 0.3" from the edge. The oval holes were originally used to allow these modules to be placed in the same threaded rows without having the 1/2 HP gap that would otherwise result. These days the oval holes are mostly just centered on the Doepfer spacing.<ref
For front panels up to 10 HP two mounting holes are sufficient, wider than this and four mounting holes are usual. To attach the modules to the mounting rails M3x6 DIN 7985 cross recessed pan head machine screws are used. The mounting hole diameter is 3.2mm (0.13"), centered 3mm from top and bottom edges and 7.45mm from the left edge. The horizontal distance between the mounting holes has to be a multiple of 5.08mm.<ref name="hinton" /><ref name="a100m" /><ref name="confused" />
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