The Shim (OEM Part No. 3115029701) is a replacement mechanical adjustment component used in Epiroc / Atlas Copco hydraulic rock drill assemblies, including the COP 2560. It is installed between associated internal components to provide controlled spacing, alignment and clearance adjustment within the rock drill mechanism. The shim helps maintain correct component positioning and supports stable mechanical operation during drilling. The 3115029701 Shim is suitable for routine maintenance, overhaul and replacement when the original shim becomes worn, damaged or requires replacement during component adjustment. Public parts documentation identifies 3115029701 as a 0.10 mm shim used in the rock drill assembly.