SV08 Extruder fix

The rod that goes into the extruder idler gear on the extruder arm likes to come loose. this will fix that. i have to push my pin back in after long prints or i end up with extreme under extrusion. this keeps the pin from getting to that point. I printed it in PLA, but would suggest something stranger just because of the location and heat. have not had any issues after adding this.