knife hinges versus euro hinges

I'm in the process of building an entertainment center and was going to use blum euro hinges on some inset bi-fold doors. Due to the nature of the euro hinges, in order to make the doors fold "flat", I would have to make one of the doors narrower than the other to work around the euro hinge cup. This would make of an asymmetrical door layout that's not acceptable. I wanted to hide the hinges if possible.
Now, I'm looking at knife hinges, but I have a few questions.
How hard is it to install knife hinges "right"? I've never done them before How much load can they handle? I'm looking to use them on 3/4" thick frame and panel doors that measure 58" tall by 15" wide each. With both doors, it's 58"x30" wide.
Any other thoughts? Or would it make more sense to stick with the euro hinges and live with the doors not being able to fold flat and adjust the interior cabinet width to accomodate the offset taken by the euro hinge?
Thanks, Winthrop
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www.youngdale.com doing a kitchen w/ them. Works great.
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calmly ranted:

That sounds like Bob Youngdale's manufacturing company.
Bob was my bestest buddy in school. We traveled around in his Cadillac Coupe De Ville camper that he and his dad built. What a hoot, haulin' ass up the mountain grades at 70mph whilst getting tripletakes from everyone we passed. You'd think nobody had seen an 8' cabover Cadillac before. I was in awe of his family machine shop over in San Marcos when we were in school. They made very good hinges. He started his own company after the other half of the family took over the biz when his dad retired.
Pass on a "Hi!" from me if you talk to him again.
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I use a fair number of knife hinges on overlay doors. They drop into a dado that will show on the door edge, so that's a consideration. I also find that they wear fairly quickly (from the exposed bearing surfaces?) FWIW, these are mostly Youngdales.

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