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The only problem is that some yokes don't have the space on the back side for a nut. These also will keep the cap in the yoke even if the cap gets loose.
I like the Toy flanges style. DS can be swaped with 8 bolts and no caps or needle bearings to mess with on the trail. Not sure how they'd work for a D60 though (or if they even exist)
Jessie at High Angle Driveline sells D60 and 14Bolt flanges for the Toy Shafts...
http://highangledriveline.com/toy_flange.html