I was looking at a post asking people for pics of their thread injectors, and it seems that there are some very serious machine nuts on here. Looked like 48 posts when I last checked. Anyway, I get it that it is desirable to be able to sew through some heavy materials or layers, but are all thread injectors sewing machines, but some sewing machines not thread injectors? My girlfriend generally won't let me touch her sewing machines, and rarely will sew anything for me unless I beg...people really are nuts about their machines... I was looking online for info about thread injectors but mainly just came up with results for sewing machines.