I found it deep in the archives. Its now stickied AND in the Cetme FAQ section.
"This project starts with the leapers low profile mount. The locking blocks are steel, and the mount itself is hardened T6 aluminum.
You can get if from Cheaper than Dirt for $30 or from Airsplat for $15. Same mount, but some folks just won't buy from an airsoft dealer. The reason I went with this mount is that like the high-dollar B&T mount, the solid sides of the base only permit the locking pieces to be drawn UP to lock them into place. There is no possibility of them splaying outwards and thus loosening as WILL happen with other mounts.
Mine feels perfectly stable, but I decided to drill and tap it for a set screw just to be sure. To give credit where credit is due, this was inspired by Str8shuter's modification. However, as I was preparing to drill the mount, I noticed that the underside has several 3/16 inch slots to engage the HK scope stops. I also know that the hole in the Cetme Reciever is 3/16 of an inch as well. Then it occured to me, "why not tap the hole, and thread in a set screw from below to engage the slot in the mount?" So I did.
The proper tap for the pre-existing hole is 12-24. You will also need a T-handle as pictured to reach the hole from below. The tap was $2, and the Handle was $5. After striping the weapon, simply start the tap into the hole from below, turn, and it is threaded in about 5 seconds, It's that easy. You then need to set and tighten the mount, with the slot over the threaded hole, and insert a 1/4 inch 12-24 set screw from inside the reciever, and tighten. This length set screw will mount perfectly flush yet allow sufficient torque to put additionall pessure on the lowere side of the mount, and hold the screw very tight. I could not find an allen-headed screw, so I am using a sloted one, but will change when I locate a stronger allen head. I will then apply locktight as well.
The mount cannot be moved. You would have to hit it hard enough to shear off the set screw or simply break the mount in order to move it. That is unlikely. As can be seen here, the mount can be used as a flat-top componant because the irons can be used over the top.
If you look at the hight difference between this mount and the SWAT mount, you understand why I said "ultimate". This mount is stable enough to use high quality throw lever rings to quickly detach the scope and use the irons if needed. I hope this helps some of you."