I was thinking of buying a lathe for my delrin but since the coil will be so small i will use the delrin material as spacers..
But i will buy a piercing tool with different mesh to make holes in my material for the core and other sections to fit inside...
I'm lucky this will be a small coil because this delrin material is far from cheap...
Those tools are useful especially for sectionnal spools designs ...
In the future i will make a professional final version design on visio for the injector and might need your help , in the meantime this is irrelevant tho , there is no specific measures for this other than the gap space was between 0,2 mm to 0,5 mm ... Its up to the person really...