Updated for 2.4r2 (#645)

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Updated to reflect changes to Voron 2.4 with R2 release.

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printer_mods/bythorsthunder/MGN9_Backers/README.md

@@ -1,13 +1,31 @@
 # MGN9 Extrusion Backer Mod
 
+Updated For 2.4R2.  Old files have been moved to separate folder.
+
 A mod to allow the installation of full length MGN9 rails on top of Y extrusions to combat thermal expansion on a V2.4.  This is based on the discovery of bimetallic flexing caused by thermal expansion, by whoppingpochard, detailed here: [Extrusion Backers](../../whoppingpochard/extrusion_backers)
 
-If the stock X rails are replaced with a single MGN12 rail ([MGN12 Mod](../../arkeet/mgn12)), that leaves two free MGN9 rails which can be used as backers for the Y extrusions.  They do not fit stock as the spacing on top of the extrusion is smaller than on the bottom.  This permits their installation without the need to cut them down.
+If the 2.4r1 stock X rails are replaced with a single MGN12 rail, that leaves two free MGN9 rails which can be used as backers for the Y extrusions.  They do not fit stock as the spacing on top of the extrusion is smaller than on the bottom.  This permits their installation without the need to cut them.
 
-Includes new Front Idler Uppers, new belt clips and a taller XY Cable Bridge. 
+Bimetallic flexing of the X extrusion in the Z direction is resolved with the use of the single MGN12 rail on the front of the X extrusion.
 
-![Idler](IMAGES/Front_Idler_MGN9_Backer.JPG)
+MGN9 rails as backers provide near perfect compensation for thermal flexing along the Y axis because they exactly match the characteristics of the lower rails.  This makes them an excellent choice as backers for Y rails.  
 
-![Rails_Installed](IMAGES/Rails_installed.JPG)
+Includes new Front Idler Uppers, new belt clips and a taller XY Cable Bridge to account for the additional height of the linear rail on the right hand Y extrusion.
 
-![Installed](IMAGES/Rail_with_idler.jpg)
+## BOM
+```
+2 MGN9 Linear Rails with carriages removed that match the length of the existing rails.
+20 M3-8
+22 M3 T-nuts
+2 M3-16 BHCS (or SHCS)
+```
+
+![Idler](IMAGES/Updated_Cable_Bridge.jpg)
+
+![Installation](IMAGES/Installation.jpg)
+
+![Installed](IMAGES/Installed.jpg)
+
+![Cad_Image1](IMAGES/Cad_Photo.jpg)
+
+![Cad_Image2](IMAGES/Cad_Photo_2.jpg)