diff --git a/mcad/README.md b/mcad/README.md
index e65c4e6..95e76f9 100644
--- a/mcad/README.md
+++ b/mcad/README.md
@@ -4,3 +4,5 @@ CAD designs
 Replacement parts, enhancements, etc.
 
 1. `lock-insert`: replacement lock core (openable with a flathead screwdriver).
+2. `stage-knob`: knob for stage rotation
+3. `vent-valve-holder`: holder for replacement vent valve
diff --git a/mcad/stage-knob-Body.step b/mcad/stage-knob-Body.step
new file mode 100644
index 0000000..2ba6e2a
--- /dev/null
+++ b/mcad/stage-knob-Body.step
@@ -0,0 +1,2640 @@
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diff --git a/mcad/stage-knob.FCStd b/mcad/stage-knob.FCStd
new file mode 100644
index 0000000..277acfd
Binary files /dev/null and b/mcad/stage-knob.FCStd differ
diff --git a/mcad/vent-valve-holder-Body.step b/mcad/vent-valve-holder-Body.step
new file mode 100644
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+END-ISO-10303-21;
diff --git a/mcad/vent-valve-holder.FCStd b/mcad/vent-valve-holder.FCStd
new file mode 100644
index 0000000..a5acbbb
Binary files /dev/null and b/mcad/vent-valve-holder.FCStd differ