OK a few folks have asked me to post this so here goes. First these are heavy #5 wire stretchers, you can do the same with #4 or for any other animal hide you want to do this way.
Here is a "jig" I made so I can make these conversions myself. 
 
 To make the Jig...
I lay the wire stretcher on the plywood. Then lay a piece of 1x2 against each side of the stretcher and nail them down. Then after cutting to length and with the insert in position I put in a couple nails to hold the stretcher against the wood insert.
Next I place a wire stretcher in the jig... 
 
 Then I place a wooden insert in to get the correct position so I can cut off the hooks... 
 
 Then using a big pair of bolt cutters I cut the side rails so they are about 1/4 inch shy of being flush with the bottom of the board insert. 
 
 Once the hooks are off I measure to insure the board is able to get my longest measurement, in this example 5X, then add the rest.... 
 
 I put 3 1/2 wraps of duct tape making sure the side rails of the stretcher are centered. I do the bottom first... 
 
 then I do the remaining marks, insuring the duct tape is tightly pulled on each wrap, I end with the cut on the tape being on the top right....The top of the tape is the length measurement when stretching your coon hides...
Here are the NAFA measurements I use...
Raccoon size, length 
5XL. Over 38" 
4XL. Over 35" 
3XL, 32"-35" 
2XL, 29"-32" 
XL, 27"-29" 
LGE, 24"-27" 
LM, 22"-24" 
MED, 20"-22" 
SML, Under 20"  
 
 Then I mark the sizes for easy reference...  
 
  The width is 8 inches at the bottom...  
 
  FHA Measurements
Raccoon
2" = 3"
6" = 5"
12" = 6 1/2"
24" = 7"
36" = 7 1/4"
48" = 7 1/2"
NAFA measurements
Raccoon (large): 
5.5" to 6" @ 11"
7.5" to 8" @ 30"
8" @ 48 to 54"
Raccoon (medium):
5" to 5.5" @ 8"
7" to 7.5" @ 25"
8" @ 48 to 54"
Raccoon (small):
5" @ 11"
6.5" @ 30"
7" @ 48 to 54"
they are then hung up to be added to the inventory...  
 
  
 here is my one of my work stations with the J and S hooks I make and some bought and home made swivels...  
 
  The insert is 3/8 thick by7 1/2 inches wide by
 16 inches long in the example I have used here... I now use a 24 inch long insert to handle smaller and larger coon.
Keep your wraps tight and where you want them. The jig was made of scrap plywood, trap stakes that I cut to short...and a few nails from when I used nails....GET A PNEUMATIC STAPLER....so much faster.
This conversion will allow you to make the money cut on your coon and get from 1 to 3 inches or more in length with out over stretching. 
The idea for this is old but the guys that helped me get started are "nebowhunter" and "bluetick". 
Pro-Hunt recommended the cross piece on top and rags the measurement charts I forgot...thanks.....well there you have it....Tom