Yes you are right, you can see it behind the keyslots shown in Post #52.
I baught it also from babamaker, also you find the in US ebay a lot.
See Post #51 there you will find more informations.
I would suggest you read everything very carefully, if you find things their not mentioned there please let me know, I always try to help then.
I am happy you found your right material now 
I think I like your method next time when I would build another one 
Well, you actually hit my nerv there, when you carefully read my bio you will know why. You should visit my website also...