| 摘要 |
<p>The guide has a primary square section tube (5) of a given fixed length that has at one of its ends, an interior spring (6) mounted to work in compression. At the other end of the tube (5) is a rubber stopper (1) that is solid to a second square section tube (2) that slides inside the first to make a telescopic assembly. A wing nut screw (3) locks the two tubes together in the working position while top eyelets (4a,4b) and bottom eyelets (5a,5b) allow the fixing of plumbing and levelling wires.</p> |
