Uploaded January 2026 | Updated September 2026, 2 weeks ago
Most mechanical failures in the workshop aren't caused by broken tools or bad luck—they are caused by a fundamental misunderstanding of chemistry and friction.
In this video, we dive deep into the feedback from our last discussion on K-Factors to answer the real-world questions: Why did my crank bolt strip? Why is my hub dragging? And why is that little washer on your stem bolt the most important component you might lose?
We also break down an Instagram repair that serves as a perfect lesson in what NOT to do. We call it the "Grease Cocktail"—mixing White Lithium, Molykote (DT Swiss Special) and Copper Anti-Seize inside a single rotating hub.
We explain the physics of why these incompatible greases migrate, mix, and eventually destroy the mechanism.
0:00 Intro: Engineers vs. Mechanics
0:35 The Philosophy: We Control Friction, Not Design
01:35 The Torque Equation (And Why It’s Impractical)
02:41 Torque vs. Tension: What We Can Actually Control
04:01 Understanding K-Factors & Data Sheets
05:44 Viewer Case Studies: Stem Bolts & Stripped Threads
06:16 The "Lost Washer": Why This Component is Critical
07:07 Shimano Cranks: The Copper Slip Mistake
07:55 Flat Mount Brakes & Hydraulic Locking
08:39 Bottom Brackets & PTFE Tape (Don't Do This)
09:42 The "Survivorship Bias" Trap
10:42 Announcement: The Mapdec Technical School
12:06 The "Grease Cocktail": DT Swiss Hub Analysis
12:51 Bearing Grease: Lithium Complex vs. The Rest
13:58 The White Lithium Mistake: Migration & Viscosity
15:57 The Copper Grease Mistake: Centrifugal Force
16:57 The Future: Carbon Bolts & Lightweight Hardware
Most mechanical failures in the workshop aren't caused by broken tools or bad luck—they are caused by a fundamental misunderstanding of chemistry and friction.
In this video, we dive deep into the feedback from our last discussion on K-Factors to answer the real-world questions: Why did my crank bolt strip? Why is my hub dragging? And why is that little washer on your stem bolt the most important component you might lose?
We also break down an Instagram repair that serves as a perfect lesson in what NOT to do. We call it the "Grease Cocktail"—mixing White Lithium, Molykote (DT Swiss Special) and Copper Anti-Seize inside a single rotating hub.
We explain the physics of why these incompatible greases migrate, mix, and eventually destroy the mechanism.
0:00 Intro: Engineers vs. Mechanics
0:35 The Philosophy: We Control Friction, Not Design
01:35 The Torque Equation (And Why It’s Impractical)
02:41 Torque vs. Tension: What We Can Actually Control
04:01 Understanding K-Factors & Data Sheets
05:44 Viewer Case Studies: Stem Bolts & Stripped Threads
06:16 The "Lost Washer": Why This Component is Critical
07:07 Shimano Cranks: The Copper Slip Mistake
07:55 Flat Mount Brakes & Hydraulic Locking
08:39 Bottom Brackets & PTFE Tape (Don't Do This)
09:42 The "Survivorship Bias" Trap
10:42 Announcement: The Mapdec Technical School
12:06 The "Grease Cocktail": DT Swiss Hub Analysis
12:51 Bearing Grease: Lithium Complex vs. The Rest
13:58 The White Lithium Mistake: Migration & Viscosity
15:57 The Copper Grease Mistake: Centrifugal Force
16:57 The Future: Carbon Bolts & Lightweight Hardware
