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"Take two ice cream sticks. (my research reveals that they are usually made 
of beech or birch). They are generally 3/32" thick by 3/8" wide by 4 1/2" 
long, with a full radius on each end.

Since they were going to handled , I gently sanded all the edges to form a 
smooth surface all around.

Next, I clamped them together, having selected two sticks as close to each 
other as possible in dimension. There are always variations and manufacturing 
tolerances involved. I clamped them to form one double stick which became a 
piece 3/16" thick by 3/8" by 4 1/2" long.

I then measured from one end, which will be considered for our purposes as the 
reference end.You can mark it if you wish.

I drilled two holes through the doubled up stick.The holes are 1/8" diameter.
They are located central to the 3/8" dimension or 3/16" from one side, and 
1/2" from the reference end. The second hole is 1 and 1/2" center to center 
from the first hole.

Then , I made a flat at the end opposite the reference end 3/16" wide. I 
drilled a small hole into the end of one stick, hereafter to be known as 
the block mounting stick.

The size of the hole is determined by the hole in the block(s) you will be 
shaping. 
In my case, the hole was .0225" of an inch. Or a # 74 drill.

Now, you will need to press a pin into the hole. A good source for pins is 
to cut off the length needed from the shank end of a twist drill. 

They are available from places like Micro Mark, etc. (I have no commercial 
interest ).

You can use carbon steel drills that are much less in cost than high speed 
steel, and ideal for our purpose.

After you the press the pin into the end of the block mounting stick, it 
should protrude about 1/8",again, determined by the size of your block.

The pin has to stick out and be a little longer than the width of the block 
to secure it and for ease of insertion. Then, I made two brass hollow rivets. 
They are going to be pressed together at assembly to contain the sticks.

Before, assembly, I slotted or elongated the hole in the clamp stick (the stick 
without the mounting pin) to 1/4" long, towards the reference end. This provides, 
when assembled with the rivets, a travel of 1/8"

I then cemented to each stick a piece of thin flat rubber with a grip surface 
3/8" wide by 2" long. At the end opposite the reference end. This allows you 
to move the clamp stick up and down easier.

Now, put the sticks together, press the hollow rivets into each other allowing 
the sticks to move easily, but without too much free play. In use, the first 
shaping session will cause the clamping stick to arrive at it's final shape.

OK, here we go. 

Hold the tool upright with the reference end down, and the pin pointing toward 
the heavens. Between thumb and forefinger, left or right, because this is a 
ambidextrous tool, pull the clamp stick down, exposing the mounting pin

Now, place a block onto the pin. It should be a firm push fit. No shake.

With the thumb, push up so the clamp stick contains the block . You have now 
created a No Fly Zone, which is the main reason I developed, designed, and 
fabricated this tool. I really do not like crawling around on my hands and knees, 
looking for miniscule parts. 

Take a good needle file and shape the block. The first time, you will be cutting 
the clamp stick as well. After you like the first side, retract the clamp stick, 
take the block off the pin, turn it over, and put the block on the pin with the 
second side up.

Push up the clamp stick.

Shape the second side. 

Retract the clamp stick, remove the block and you are ready for the next block, 
and the next block , etc ad infinitum......

One important tip, to try to cut down on the loss of blocks, which can occur unless 
they are in the No Fly Zone, try rolling the block between your thumb and finger, 
and place it into a suitable container. I say suitable, because if the container 
is not screwed to the workbench, Murphy's Law states that the container, and all 
the blocks and your hard work, will be scattered to the four winds. 

If you want to cheat, and not use, or can't make hollow rivets, I offer the 
following solution. You can bolt them together with screws, and washers, (on 
the nut side) and nuts. After you have the movement the way you want it, put a 
drop of CA into the nut.

Another alternative, make friends with your local machinist. :)

However that is not in keeping with the highest tradition of the Jerry Glickstein's 
School of Toolmaking."