Everytime I inject it plugs and I have to remove the pin, unplug and move to another site. Last time It took 4 times to get 1ml in. I shake the suspension for about a minute, it draws fine from the bottle.I change the tip of the pin to a new one. When I inject a small amount will go in then the pin plugs. Whats going on it is truely a pain in the ass.I am using a 22 awg B&D pin. Any advice thanks. Ergo

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