All About Pocket Knives

Hi, I came across this blade on ebay http://www.ebay.com/itm/160855145209?ss ... 1423.l2648 (hope the link will open) I was wondering why the pivot hole in the blade is the shape it is. I was going to but it to make a lock back folder but now I am hesitant.

In the event that it is not suitable any ideas or suggestions on where in could buy another blade please?

That is for one on the knives that open with a lever on the side.
I think they were called a lever lock.

Dale, thanks for that. I shall keep looking.

The correct name was Lev-R-Lok.
Here are some quick scans of mine.

I appreciate the feedback thank you.
P.S. I like that lockback