Repair and modification work frequently involves components whose original angular positions are difficult to determine from appearance alone. SISCO protractors can help technicians establish measurable reference points when repairing machinery, modifying structures, or replacing components with custom-fabricated parts. During repair work, an angle can be measured on an existing component and then transferred to a replacement piece, helping the technician reproduce the original geometry. This approach can be useful when original drawings or dimensional records are unavailable. Digital protractors can simplify field measurements where technicians need quick readings while working around installed equipment. Vernier bevel protractors offer a mechanical measurement method for workshop-based repair tasks involving machined or fabricated parts. General angle protractors can be used for layout, angle transfer, and preliminary checking during custom modification work. Applications may include machinery brackets, equipment covers, adjustable supports, access structures, mounting assemblies, fabricated guards, and replacement panels. In maintenance workshops, a protractor can also help technicians compare the angular position of components before and after repair. This can provide a measurable reference when investigating alignment-related problems or confirming that a modified assembly has been positioned according to the intended design. Custom modification projects benefit from angle measurement because existing equipment often presents physical constraints that are not obvious from standard drawings. A technician may need to measure the available space, determine the angle of an existing surface, and fabricate a component that fits within that geometry. SISCO protractors can support these stages without requiring a large inspection system. Their portability also makes them suitable for mobile maintenance teams and service workshops that need basic dimensional tools available at the job site. From replacement-part fabrication to equipment modification and structural repair, the three SISCO protractor types provide complementary ways to establish angular information. This makes them useful supporting instruments for maintenance personnel, repair technicians, fabrication workers, and engineers involved in restoring or adapting existing equipment.