IMac physical security options

Question

The campus where I work has recently experienced a rash of iMac thefts from our labs. These computers were locked down with security cables, but the thieves clearly have a good pair of bolt cutters, and the cables failed to deter them.
As a result, we've been looking at non-cable-based physical security options for iMacs, of which we've found only two:
- The Noble Security Plate for iMac, http://store.apple.com/us/product/H4848LL/A
- the Anchorpad iMac Plate System, http://www.anchorpad.com/products/security-for-mac-computers/lockdown-plates/ima c-plate-system
We've also tried the Cavalier Lockdown Plate, which is not specifically for the iMac: http://www.computersecurity.com/lockdown/plates.htm
The problem is this: in our testing, all three of these were easily defeated with a small crowbar. I can't really call this a design failure on the manufacturer's part; I understand that any security kits are deterrents and not guarantees against theft. However, it seems reasonable that thieves equipped with bolt cutters would probably also have crowbars.
So my question is this: are there any iMac security solutions that could deter thieves of this caliber? I'm thinking of perhaps going with a home-grown solution: drilling through the iMac's foot and the table that it's on, and securing it with bolts large enough to deter bolt cutters.
Any suggestions/comments would be greatly appreciated!

Answer 1

Drill two quarter-inch holes in the base of the iMac's stand. Drill two corresponding holes in the desk top where you want the iMac to be positioned. Insert two quarter-inch hex head hardened bolts through the holes in the iMac's base and the desk top. Use bolts that are long enough to extend about an inch below the underside of the desktop.
From the underside of the desk, install a quarter-inch "body" washer (ask at your local hardware store) and then a conventional washer and a fiber-core security nut. Before tightening the fiber-core nut, apply a drop of Lock-Tite Thread and Bearing Mount to the threads of the bolts. The Thread and Bearing Mount will require the application of heat to remove it. (Ask me how I know.)
Once the fiber-core nuts are tight, use a pair of Vise-Grip locking pliers to destroy the exposed threads on the bolts by crushing them between the jaws of the Vise-Grips. That will  make the nuts impossible to remove.
When it's time to upgrade to new iMacs, sell the old ones and the desks they're attached to together as a package deal.