Tried 1/2 inch needle for first time, after doc suggested that short needle length was my main problem with not reaching cavernosa consistently.
Was nervous as heck, since I could not figure out where that long a needle would end up....but I survived.....and hit the spot....no resistance when I depressed the plunger. Before I have run into resistance about 75% of the time.
Now....knock on wood....HOPEFULLY I can consistently hit the spot and figure out which formula and dosage thereof works best for me.
Back to work....