In wall weekly that’s for sure indicate that this sliding arrow with a window cut out, for example, of cardboard, glued back zasypkoj of the same material.
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Carefully cut a circle from the cardboard using scissors is very difficult. To help in this work can usually tsyrkul fixed in his foot, as shown in the figure, a razor blade.
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Offer to improve a closure for closing window frames: it a metal plate with a slot for fixing the "tongue" needs to be set obliquely, as shown in the figure. Now, if zakryvanii frame in...