I have 29 guage 1/2 in insulin pins i backloaded the insuling needle with the oil and pinned delts took a min too get all the oil out but can i use these all the time now does anyone else use these for delts there 1/2 inch long which i bury and there is no fat on delt so it def should be in muscle any one do this ? Main reason i ask i am goin too start EOD and it just alot easier for me too use these