UPDATE 02-Jan-2018: There is no need for this fix any longer. Recent versions of Crowbar (0.49 and later) should be used for decompiling the survivors, and the "Include $definebone lines" option should be enabled/ticked.
Each decompiled survivor model needs to have the "right-hand fix" to avoid the infamous "warped right hand" problem.
Warped right hand from unaltered decompiled files
Corrected right hand after applying the fix
NOTE: If you used the Crowbar tool's option for Apply "Right-Hand Fix", then you can skip this page of the tutorial.
In the nodes section of the reference SMD file, find this bone name: "ValveBiped.weapon_bone"
An example line, found in Bill's reference SMD file:
58 "ValveBiped.weapon_bone" 37
That 58 is the index in this example.
In the same SMD file goto next section, skeleton, find that index number as first number on the line (58, for example).
Put 3 zeroes for the 2nd through 4th numbers.
An example line:
58 2.856899 -1.536200 -0.973800 -1.501147 -0.272558 -1.578261
For this example, change that line to:
58 0 0 0 -1.501147 -0.272558 -1.578261