diff --git a/nema_steppers.scad b/nema_steppers.scad
index b4ffaf8..308552f 100644
--- a/nema_steppers.scad
+++ b/nema_steppers.scad
@@ -466,7 +466,7 @@ module nema34_stepper(h=75, shaft=12.7, shaft_len=32, anchor=TOP, spin=0, orient
 //   nema_mount_holes(size=17, depth=5, l=5);
 // Example:
 //   nema_mount_holes(size=17, depth=5, l=0);
-module nema_mount_holes(size=17, depth=5, l=5, slop=PRINTER_SLOP, anchor=CENTER, spin=spin, orient=UP)
+module nema_mount_holes(size=17, depth=5, l=5, slop=PRINTER_SLOP, anchor=CENTER, spin=0, orient=UP)
 {
 	motor_width = nema_motor_width(size);
 	plinth_diam = nema_motor_plinth_diam(size)+slop;
diff --git a/sliders.scad b/sliders.scad
index 8d8fe77..bd7eeae 100644
--- a/sliders.scad
+++ b/sliders.scad
@@ -36,6 +36,7 @@ module slider(l=30, w=10, h=10, base=10, wall=5, ang=30, slop=PRINTER_SLOP, anch
 	full_height = h + base;
 
 	orient_and_anchor([full_width, l, h+2*base], orient, anchor, spin=spin, chain=true) {
+		zrot(90)
 		down(base+h/2) {
 			// Base
 			cuboid([full_width, l, base-slop], chamfer=2, edges=edges([FRONT,BACK], except=BOT), anchor=BOTTOM);