There are at least 4 types of mounts:
a) QMBIX12-x? Good for 12 blocks (300 pair)(I seldom use them)
b) QMBIX10A Good for 10 blocks (250 pair)
c) QMBIX10B Good for 4 blocks (100 pair)
d) QMBIX10C Good for 2 blocks (50 pair)
The normal ones used are b, c & d. In fact, QMBIX10A's are readily available up here from out orders. When a I get a surplus, I cut the mount into a 4 block and a 6 block mount. Thus I can install whichever will fit the job & a little for spare. Even if I've used a smaller mount, then they expand to the point that I need more blocks, I wire in a way that I can easily replace the mount for a larger one. No banjo stringing here!
Justification? Hey, pay now for the best & forget the rest!
It's like terminating data cables with jacks +/or patch panels or with just modular plugs. I would pay more for a quality installation.
If a client bitches about the cost, guess what he gets in return. Almost always have me change it and are willing to pay for it. I carry some pics when I quote to show the difference.
