How can the thimble and the pin hole cooperate in the mold?
Is that a gap of about 0.5 in bilateral, the mother template will have clearance of about 0.05 out of the top hole, the clearance between them and you can imagine the general panel with thimble precision is not very high, if the top is a bit offset push rod is bent or even scrapped
General holes should be large, 3 filaments small, 3 filaments or so
The thimble is 0.05 smaller than the top pinhole
