Stumped by a Master Commercial

[emt1581]

The other day I was trying to pick a "Master Commercial" lock. Looked simple enough and nothing special about the keys. However, I must have worked on it for 10 minutes and I couldn't get one of the pins set. I tried tensioning top of the key way, bottom...nothing worked. The other three were no problem and took...maybe...5-10 seconds. But this one just wouldn't find it's home and stay put. It kept springing right back to place! It was really frustrating!

I was using a Mad Bob's pick set, and tried to rake, then pick each pin separately with a half-diamond. I put so much force on the handle of the picks trying to get this one pin down that I actually cut the center of my palm with the back end of it.

Any thoughts on what I may have been doing wrong that the one pin would never set?

Thanks!

[stratmando]

Try a hook, also wrap something around pick, pain can distract from feel

[stratmando]

Til better qualified respond, also apply more tension, then less tension

[billdeserthills]

Spray some lubricant in the keyhole