diff -ur vanilla\src/osd/windows/input.c tt2_Zaxis\src/osd/windows/input.c
--- vanilla\src/osd/windows/input.c	2008-01-05 16:47:40.000000000 -0800
+++ tt2_Zaxis\src/osd/windows/input.c	2008-02-19 15:23:54.000000000 -0800
@@ -2026,7 +2026,7 @@
 
 				// update zaxis
 				if (data->usButtonFlags & RI_MOUSE_WHEEL)
-					devinfo->mouse.raw_z += (INT16)data->usButtonData * INPUT_RELATIVE_PER_PIXEL;
+					devinfo->mouse.raw_z += (INT16)data->usButtonData * 4.267;
 			}
 
 			// otherwise, update it as a lightgun