| 摘要 |
An upstanding body is provided having front and rear sides and the upper end portion of the body includes downwardly facing abutment surface portions spaced slightly outwardly of the rear side of the body while the lower end portion of the body includes lower upwardly facing abutment surface portions spaced outwardly of the front side of the body. The lower end portion of the body defines an upwardly opening generally horizontal channel forwardly of and extending across the front side of the body and in which to embracingly receive a lower marginal edge portion of a siding member. The upwardly facing abutment surface portions are disposed within the channel and comprise the upper peripheral portions of a roller journaled from the body within the channel for rotation about a horizontal axis extending in a front to rear direction relative to the body. The upper end of the body includes a crosshead secured to the rear side thereof and the downwardly facing abutment surface portions comprise upstanding abutment screws threadedly secured downwardly through the opposite ends of the crosshead.
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