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This is a generic gold crown and tube set designed for the Mido M036.407 series, featuring a crown diameter of 6.6mm and a height of 3.36mm. The set includes both the crown and its matching case tube, providing a comprehensive solution for repairing worn or damaged winding systems while maintaining the original two-tone aesthetic.
Proper Crown Operation (Screw-Down Type):
Unscrew: Turn the crown counter-clockwise until it releases from the case tube threads
Position 0 (screwed down): Normal running position, maximum water resistance
Position I (unscrewed, not pulled): Manual winding (turn clockwise)
Position II (unscrewed, pulled to first stop): Quick-set date correction
Position III (unscrewed, pulled to second stop): Time setting
Important Reminders:
Always screw the crown down fully after adjustments to maintain water resistance
Never pull the crown without unscrewing first – this can damage the setting mechanism
If the crown feels resistant when turning, do not force it
Tools Required:
Case back opener
Pin vise or spring bar tool
Non-metallic tweezers
Small screwdriver (for movement release)
Silicone grease (for gasket)
Crown tube press tool
Loctite 222 (low-strength threadlocker)
Step-by-Step Installation:
Step 1: Remove the Old Crown and Tube
Open the case back and locate the crown release mechanism (press the button near the stem)
Gently pull the crown and stem out of the movement
Unscrew the old crown from the stem using a pin vise
For tube removal: Use a tube press tool to push the old tube out from inside the case
Step 2: Clean the Case
Clean the tube hole and crown seating area using isopropyl alcohol
Remove all old adhesive and debris
Step 3: Install the New Tube
Apply a small amount of Loctite 222 to the outside of the new tube
Insert the tube from the outside of the case
Press firmly until the tube sits flush with the case surface
Allow adhesive to cure (10-15 minutes)
Step 4: Prepare the New Crown
Apply silicone grease to the crown‘s rubber gasket
Screw the new gold crown onto the winding stem (clockwise, snug fit only)
Step 5: Reinstall and Test
Insert the stem with new crown into the movement until it clicks
Test all crown positions (winding, date setting, time setting)
Professional water resistance testing is strongly recommended
Common Symptoms Indicating Crown/Tube Replacement is Needed:
| Symptom | Possible Cause |
|---|---|
| Crown spins without tightening | Stripped threads on crown or tube |
| Crown pulls out without unscrewing | Worn screw-down mechanism |
| Difficulty winding | Worn crown or stem threads |
| Water enters watch after exposure | Failed crown gasket or damaged tube |
| Visible corrosion on crown | Oxidation from moisture exposure |
When Replacement is Necessary:
Stripped or damaged threads on the crown or tube
Cracked or hardened gasket
Visible corrosion or physical damage
Crown no longer screws down smoothly
Preventive Maintenance:
Replace gaskets every 3-5 years during regular service
Always screw down the crown after adjustments
Rinse the watch with fresh water after saltwater exposure before operating the crown
Avoid over-tightening the crown
Q1: What models is this crown compatible with?
A: This crown is specifically designed for the Mido M036.407 series. Always verify your original crown dimensions (6.6mm diameter) and thread type before purchasing.
Q2: Does the crown need to be screwed down for water resistance?
A: Yes. The original watch is designed with a screw-down crown system for water resistance. When the crown is in the unscrewed position, the watch is not water-resistant. Always screw the crown down tightly after making adjustments.
Q3: Can I install this crown myself?
A: If you have experience with watch repair and the proper tools (case opener, pin vise, tube press, etc.), installation is possible. However, for users without experience, professional installation is strongly recommended. Improper installation can compromise water resistance and damage the movement.
Q4: How do I maintain the gold finish?
A: Clean the crown periodically with a soft cloth and mild soapy water. Avoid harsh chemicals (perfumes, chlorine, cleaning agents) that may damage the gold finish. Do not use abrasive polishes as they may wear through the coating.
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