the world needs a syringe that is battery powered and initiated with the easy single push of a button that activates battery powered gears to depress/inject oils. 30 seconds per cc perhaps.
regardless all other reasonable arguments,
i will always be convinced that it is the tip of the needle not being held completely still while within the tissue that is the main cause of sore injection spots.
a battery powered syringe would give the user a MUCH MUCH more still and steady hand when pinning.
this will reduce muscle tissue damage at the needle tip allowing for much less painful pins.
of course this wouldnt be easy to create, and of course there will always exist that "im tough crowd" that would call such a device sinister,and un-sport like, but none the less
i write this hoping that it might, by rare chance, fall into the mind of an able engineer that might have this contraption available for us soon.
Thx. Good Luck.