Murphy Laws of Modelers

A big enough wrench removes any cylinder.
Any engine part when dropped will roll into the least accessible corner.
If glow head doesn't fit, use a bigger wrench.
The one engine you want is never the one on sale.
Interchangeable parts won't.
Any bellcrank wire cut to length will be too short.
It costs more to fix it than to buy a NIB engine.
Instructions are that which will be read as a last resort.
Any fix that can go wrong will go wrong.
A clean shirt always attracts the fuel.
The one engine part you need is always in short supply.
A hot glow head looks exactly the same as cold glow head.
All warranty and guarantee clauses become invalid upon payment of the final invoice.
You can never tell which way the propeller turns by looking at it.
Fill what's empty. Empty what's full.