This is a Yale that I have. If you add up all the hours that I have spent trying to SPP it, it would add up to weeks. Like I said they are not the easiest locks to start on, especially if you are trying to SPP them.
A little while ago I tried my “Magic” half moon and, bugger me, it opened up immediately???
I locked it up again and tried again with the same result.
I made it a couple of years ago and polishing and use have flattened down and smoothed out the peak. The reason I call this pick “magic” is that it seems to open most anything I try it on.
There are a couple of features that may help explain this; the first is that it has become a bit rounded and is not the sharp shape that is usually found on half diamonds. It is highly polished and is very kind to pins and lastly the way I use it.
I use it like a cross between a rake and a single hump Botota. I put it all the way in and using light tension start from the back, raking/jiggling it over a couple of pins at a time, working my way to the front. After a couple of tries I let off the tension and start again. The lock will usually open after a few tries.
Click on picture to get a better look.
I know it is not SPP but it opens the lock and sometimes that’s all that matters.
Hope this has been of some help.
Cheers.
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