Thanks Thalweg, Thats basically how it works, I'll give ya a step by step on how constructed it. I should have takin some pics during the build of this stand to show you better how it works. I'll try to make since here. Ok what I did was after making the 2+6 framing, I squared and centered the planer on it and bolted it down. Next I cut 2 cross braces to go under the mdf Tops. Next cut the mdf tops to fit inside your opening leaving about 3/16" on each side so that it has room to glid up and down. Next, lay your mdf on the stand exactly where you want it to go and clamp it down. If you're planning on using 5/16 carriage bolts like it did then drill out 1 hole in each corner where you want the adj knobs to go. make sure to drill these holes out 7/16 bit to allow up and down movement. Next I drilled out 4 more holes where you want to put the 4 glider/stabilizer tubes but only drill through the mdf. Next, remove the mdf and put your long carriage bolts through the bottom of your 2+6 framing and add 1 washer, nut and snug it down good. After it's good and tight add 1 washer then the compression spring. I don't actually know the size of the spring but it just large enough to fit around the spring and about an inch long and pretty darn stiff. You need a pretty stiff spring or when you put your lumber on the table it might through it out of flush. Ok so you have the spring on, now add another 5/16 washer and line up the mdf top and slide it over the 4 bolts. Add 5/16 washers to the bolts again and screw on the knobs. Ok, you still have the four larger holes in the mdf for the stablizer tubes. You could use anything really for this I just had some copper lying around so I used that. I just simply measured from the bottom of where the copper would sit on the frame to the top of the table and added a couple inches and cut it and used lag bolts and a washer to hold it down.