Guides and how-tos
Page 2 of 4, from 39 guides in all.
EMT vs IMC vs Rigid Conduit: When to Use Each
What actually separates the three common metal conduits: wall thickness, where the code allows each, how the wire fill differs, and why IMC gets overlooked.
BendPro 7 min read 
DVIR Explained: What Drivers Must Inspect and Log
What a Driver Vehicle Inspection Report has to cover, why no defect usually means no report, and the signature chain that fails audits even when the truck got fixed.
DVIRLog 7 min read 
FIRE in the UK vs the US: SIPP and ISA Against 401k and Roth
Most early-retirement advice is written for the American tax system. Here is what actually changes for a UK saver, from the age 57 lock to why the ISA carries the plan.
FireCalc 10 min read 
TNR Explained: How Trap-Neuter-Return Actually Works
What trap-neuter-return involves from first count to release, why the ear tip matters, and the honest version of what percentage of a colony you have to reach for it to work.
CatColony 7 min read 
How to Price Handmade Candles (Cost + Margin)
Work out what a candle really costs you, including the fees and the labour most makers leave out, then set a retail price that survives wholesale.
CraftCost 8 min read 
Standby Generator Maintenance: Hours, Calendar and the Weekly Exercise
A standby generator runs a few hours a year and still has to start on demand. Here is what actually needs servicing, on which clock, and why the battery fails first.
GeneratorLog 9 min read 
Car Detailing Steps: A Professional Sequence
Every detailing stage exists to set up the next one. Get the order wrong and you grind grit into paint or seal a coating over polish oil. Here is the sequence.
DetailProof 7 min read 
How Often Should a Mechanical Watch Be Serviced?
The old answer was every five years. Modern manufacturers say much longer. Here is what actually changed, what a service involves, and the symptoms that override any interval.
WatchLog 7 min read 
Pool Water Chemistry Basics: pH, Chlorine and Alkalinity
Five numbers run a pool, and they are not independent. Here is what each one does, how they pull on each other, and the order to fix them in.
ClearPool 7 min read 
Guyton-Klinger Guardrails: Flexible Withdrawals Explained
The 4% rule assumes you never change your spending. Guardrails write the adjustment into the plan instead. Here is how the four rules actually work.
FireCalc 8 min read 
Monte Carlo Retirement Projections: What a 95% Success Rate Really Means
A 95% success rate is not a 5% chance of destitution, and a 100% target is a mistake. How the simulation works, what the number hides, and how to read the fan chart.
FireCalc 8 min read 
Stair Stringer Layout: Rise, Run and the 7-11 Rule
Total rise divided by the riser height you want is the wrong first move. Here is how to lay out a stringer properly, with the code limits and the bottom-riser trap.
StringerPro 8 min read