Procedure for drilling holes in telescopes.
a) Check hole position and measurements.
b) Do not rush, check hole position and measurements again.
c) Now that you are sure....check hole position and measurements.
d) Drill hole, only when you sure of hole position and measurements.
Ask for a second opinion. Never hurts to have someone else to check that you are doing the right thing.
There is no recycle bin or undo function when drilling holes in telescopes.
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