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I would probably do as Jim suggested and justlay some plastic sheeting against the rocks to keep the concrete from locking into the rock too badly. Another way would be to lay a peice of thin flexible plywood up against the rock wall which would leave an irregular gap which could then later be filled with some mortar.
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne
0% Liberal
Men do not quit playing because they get old.... They get old because they quit playing.
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