A replacement slat can come out short even when you checked the measurement twice. Before blaming the saw, look at the tape measure. Its little end hook gets dropped, caught on bench edges and packed with dust. If that hook no longer sits or slides properly, repeating the same measurement can repeat the same mistake.
On a typical sliding-hook tape, a small amount of movement is intentional. The hook shifts to account for its own thickness when you switch between hooking over an outside edge and pushing against an inside face. Do not tighten the rivets just because the end feels loose. Check the maker’s guidance if you are unsure how your tape should behave.
Brush away loose debris and inspect the hook in good light. Look for a bent lip, damaged rivets or movement that sticks rather than sliding freely. Compare a short hooked measurement with a reliable rule on a flat scrap. Then check a pushed measurement from a square stop against the same rule. Keep the tape straight and read directly above the mark; an angled blade or a rounded reference edge can confuse the test.
If the readings disagree, set that tape aside for repair or replacement rather than bending it by eye and hoping. For a short part, a sound rigid rule may be simpler. Another option is to align a clear graduation farther along the tape with the starting edge, then subtract that starting reading from the end reading. Write down both readings and the resulting length so the offset is not forgotten at the saw.
Once the measuring tool checks out, measure from one clearly marked reference edge throughout the job. An old slat can serve as a pattern only if its ends are intact and you have checked that its length is still right for the opening. Dry-fit the replacement before fastening it; accurate measuring does not remove the need to check the actual fit.
Practical takeaway: inspect the hook, compare push and pull readings with a dependable reference, and use one measuring tool for the repair. A little hook movement is normal. A bent hook or inconsistent reading is a reason to stop before turning good wood into another short part.
MeasuringHand ToolsCrate Repairs