.........3,000 miles from now, you get to do this all over again.
Your escapade sounds precisely like me this past Wednesday. I experienced exactly the same thing ... except for the cut finger that is. In my case, it was skint knuckles... and a lacerated thumb.
Also jumped the 'gun' ... in a manner of speaking, and 'assumed' the tubes were empty. NOPE!!!! Damn thing 'burped' all over me when taking the cylinder off. So, out of 3 tubes, probably wasted about 1 full one.
But never mind ... got the black stuff to squirt out also.
Have decided to visit WWorld again, and next time, get the larger version of these contraptions. The little hand-gun type is for the byrds!!!!
Paul
That's not only newbie to TM ... but also to 'squirt grease guns'.