roof shingle repair after moving satt. dish mounting pole

Hello, Today I moved my satt. dish. The trees in my front yard had grown too large and were blocking the signals. I moved it from the top of the garage to a higher level on the main part of the house. Went from getting signals of about 50% to 60% to over 100%. Problem is the roof is about 4 yrs. old and the place I removed it from now has 4 holes. I did fill them with a silicon product that will stop any leakage through the roof but it is unsightly. I do have some left over shingles that the original roofer left me. I want to cut out(?) the shingles where the holes are and replace them with the left over shingles I have. How do I do this. Thanks for any info. Dan.
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Just pry up the shingles where the hole is and place a shingle under the outer most shingle and trim to fit and then glue down with 30 year roofing adhesive - not silicone.
And do all this in the cool part of the day when temp is between 75 and 80.
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