Principles of Universal Design

The seven “Principles of Universal Design” from NC State University Center for Universal Design were used as guidelines in the development of the Threadstone tool.

1. Perceptible Information
Threadstones provide easily interpreted indications of damage requiring repair, and easily perceived evidence that the repairs are complete.

2. Tolerance for Error
Threadstones are configured so that damage does not occur if they are improperly applied.

3. Intuitive Use
If the stones are handed to an experienced mechanic without explanation, the mechanic knows what they are for and how to
use them.

4. Flexibility in Use
Threadstones can be used:

  • By hand for inspection and repair.
  • In a fixture to provide rapid cleaning, inspection and repair.
  • On palleted through-bolts as well as closely spaced in-place stud bolts.

5. Appropriate Size and Space
A mechanic can apply the Threadstone System to the bolts where they stand, including between in-place stud bolts, even when the cover secured by the bolts is in place.

6. Low Physical Effort
One mechanic can easily use the stones.

7. Equitable Use
Experienced mechanics quickly understand the Threadstone. Inexperienced mechanics usually can understand and work the system after instruction with one bolt.