We added an additional single row of shingles under the bottom row. To fix these new shingles, we used a shingle snake tool ( we found it on Amazon ) without damage to the existing shingles.

PacTool Roof Snake Tool | Shingle Pry Bar | Heavy Duty Nail Remover Tool | Professional Roofing Tools | Efficient and Durable for Roofing Projects
https://amzn.to/480bIBv
Some of the uses for this tool are found on Amazon in the descriptive list below the tool:
COMMERCIAL CROWBAR: Replace old and wornout composition roofing shingles in no time with our practical pry tool. Our roof snake makes removing and applying new shingles more accurate, efficient, and safer than traditional replacement methods.
ROOFING TOOLS AND EQUIPMENT: Never damage your roof again with this convenient pocket pry bar. Install new 3tab shingles without bending or hitting surrounding shingles or accidentally striking your fingers with your hammer in the process.
HAND TOOLS: A musthave for all roofers, this tool is forged from highstrength steel and has a patented offset nail slot feature allowing you to align nails with the correct oneinch offset from the bottom edge of your current course.
NAIL PULLER TOOL: There is no need for a flat bar with this handy claw tip, Easily loosen and remove old, damaged shingles and nails by driving the claw end under the nail, rolling the nail out, and twisting the roof snake.
PACTOOL: Trusted for decades, we are the leaders in specialized construction, renovation, and remodeling designs. Our cuttingedge product line inspires craftspeople and DIYers to work smarter, measure better, and repair more efficiently.

Our experience using this shingle tool was quite satisfactory. It really saves unnecessary bending of the existing shingles. Seems like this tool is something anyone repairing shingles might want to have in their tool box.

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