So I was looking online and never really saw any videos or anything on dimensions of how to make your own L rake. So I figure I'd at least give some insight as I'm new to this hobby and figure those starting out are finding out that picks aren't cheap for what they are made of and how cheaply they're probably manufactured.
Onward, I've been making my own picks since I like working with my hands and I also am one of those types that trust himself to do it right rather than someone else. So looking at an L rake it seems to be the most difficult pick of a beginners set to make DIY style.
First you want to start off by making a pick blank. I'm sure there are plenty how tos on the forum of making a pick blank or other picks so I'll let you figure out your dimensions that you'd prefer for your pick up until the the end of it which will be the actual tool end I'd say.
So as usual leave yourself a bit of a block on the end to shape your pick out of.
Then take out one of your keys and vice grip in on to it. Try to find one that's a little diverse in it bitting. You will only need what above the top groove of the key so align it accordingly.
Then take out your dremel with a cutting wheel or small grind stone and copy your key. You can change if you want as you go or add a couple more heights for more pins. Any ways here's mine.
http://tinypic.com/view.php?pic=euou2f&s=5
So hope it helps other newbies let me know. And also if you have any questions on the process please ask.