Flush arm partial replacement

Partial replacement for the flusher arm of a Eljer Toilet when the end of mine where the chain connects rusted apart. For this part to work, you need to have 7.2 mm of the flush arm still left at the point where it widens. The size of the internal slot where I inserted the printed part onto the existing metal is 7.2mm deep and 8.6mm wide and 2.1mm thick. In the case of my toilet, it was able to push fit it on with some force. Slightly scaling the piece up or down to accommodate different thicknesses or the use of JB weld would likely work as well and let this piece be used for other toilets.