At the beginning of super, then quickly made limp

In the first 10 pins I was extremely excited. The result was brilliant. Then the timber was always shelled unclean, and the result unfortunately pin for pin rapidly worse. The tips of the mines then cracked gone too.
I do not know what it was, but the tips broke increasingly as if the pencil sharpener dull after only 10-15 pins or too hot ?? become and could no longer fulfill approximately the initial power. (A physicist or craftsmen / material master can me maybe easily explained) So I came only passable through the first half pastel box and had abbrechen..Da I ordered two of the Derwent sharpener, I am anxious to Spitzer No. 2.