The 3504116 bushing for Gildemeister DMG Mori GM32, GM35, GM35AC, GM42 and GM42AC is a mechanical guide component installed in the 3504112 fork to keep the 3504113 eccentric shaft correctly guided during rotation of the drum drive system. Its function is essential in the indexing kinematics of the machine because it works together with the fork, the eccentric shaft, the 3704115 camshaft, the 3504115 roller and the 3504138 Geneva cross, contributing to the motion transmission that rotates the spindle drum. During the machine cycle the camshaft drives the fork, the bushing keeps the eccentric shaft guided and allows correct dynamic coupling with the engagement elements of the Geneva mechanism, reducing unwanted backlash, misalignment and irregular sliding that could compromise positioning accuracy. In a multi spindle lathe the timing between cams, drum, spindles, tool carriers, feeds and auxiliary movements depends on the regular operation of every element in the kinematic chain, so the 3504116 bushing must not be considered a simple spacer but a true guide and support element for the eccentric shaft. Internal wear of the bushing, ovalization, poor lubrication, uncontrolled fitting or incorrect alignment during assembly can generate radial and axial play, vibration, sticking, delayed engagement and loss of synchronism during indexing. These defects may appear as rough drum rotation, non repeatable positioning, abnormal noise, accelerated wear of the roller and bearing, difficult fork adjustment and reduced production reliability. The bushing is therefore a wear part that must be inspected carefully during preventive maintenance and replaced during extraordinary maintenance when it shows wear marks, scoring, seizure, increased clearance or loss of guide geometry. For a correct repair of the group it is advisable to evaluate the 3504116 bushing together with the 3504113 eccentric shaft, the bearing, the 3504115 roller and the condition of the 3504112 fork, because replacing only one component without checking the couplings may not fully solve the indexing problem. Installation must be performed by technical personnel with specific experience on Gildemeister multi spindle lathes because the work requires inspection of the seat, backlash verification, respect of timing positions, parallelism control, correct alignment of the eccentric shaft and functional testing of the spindle drum movement after repair. A bushing in good condition allows the eccentric shaft to work with stable guidance, improves repeatability of drum positioning, reduces abnormal stress on connected components and contributes to the overall precision of the machine, especially in the production of turned metal small parts, automotive components, precision mechanical parts and applications where production continuity and dimensional repeatability are decisive. Tadaah offers this spare part as a technical component for qualified maintenance and repair operations on Gildemeister DMG Mori machines, with a description designed for technicians, maintenance specialists, process engineers and workshop managers who need to identify the part correctly, understand its function and plan a reliable repair of the drum rotation group.