Grease injecting adaptor for MGN12 linear bearings. Some linear bearings don't come with lubrication holes. I made this adaptor so the bearings can be greased without dismantling the assembly. Just snap on the Greaser on the extrusion and position the bearing over the grease outlet and inject the lubricant through the inlet. Bicycle bearing grease pump or syringe can be used. Please read included Greaser instructions.pdf . 1515 pump.stl - for 1515 extrusion and inlet for grease pump 2020 pump.stl - same as above but for 2020 extrusion 1515 syringe.stl - 1515 extrusion and inlet for syringe 2020 pump.stl - same as above but for 2020 extrusion