The Tasco WC scopes were made at two different facilities at two different times. When made at one facility, they were quite good, as you yourself have experienced. However, for whatever reason, when they were made at another facility, the quality control was bad, and so too were the scopes. With the WC scopes, either you will get a good one or a bad one, you were fortunate that you got the good one. Like I said, the problem is the risk involved in buying it because there is no longer any customer warranty after the company went bankrupt.
Zachary