| 摘要 |
A datum part (10) comprising a base (20); a left-hand side stop block (23) positioned towards a periphery of the base (20) on a left-hand side of the base; and a right-hand side stop block (25) positioned towards a periphery of the base (20) on a right-hand side of the base. The left-hand side stop block (23) is formed with a resilient spring (23a) and the right-hand second side stop block (25) is not formed with a resilient spring. A stringer (30) is engaged by the right-hand stop block (25) and the resilient spring (23a) of the left-hand stop block. The resilient spring (23a) flexes to account for variation in width of the stringer (30). |
