| 摘要 |
<p>A fastening device for use in association with a recess having a restricted opening and having a shaft having a leading end designed to enter the recess and a trailing end extending therefrom, a retaining device formed on the leading end, having a width such that it will fit within the opening of the recess, a rotation inducing device on the trailing end, and frictional formations on the retaining device oriented to engage interior surfaces of the recess, and retain the device against releasing forces.</p> |
