That is interesting, konrad. My young pears showed a chunk that was eaten so I assume caterpillars of some kinds.

Some got eaten To 1/3 of fruit with no seed or anythinf inside left. I assume those were codling moths doing.

Have not seen one with a pin hole mark like yours. Have you cut it up yet? What was inside?

Yeah..seen your kind with chunks missing on the web but not like mine.

Today I picked more, [just about ready to drop] the larger pear is holding on the tree. I'll see if I can find anything inside...will have look into some magnifying glass.

Cut some open, ..it appears that I found some eggs, very very tiny, they
looked white but by the time I had them out and under the
light they turned brownish, so... there has to be a pesky fly laying eggs!

Got an answer from a expert, Dr Ken Fry....

The damage and larva looks more like a weevil than a fly. I
suspect the apple curculio, Anthonomus quadrigibbus, rather than the
plum curculio, Conotrachelus nenuphar because the feeding and egg-laying
holes are simple and not associated with a brown discolouration in a
fan shape.

To treat for this weevil you apply
pesticide at petal fall and then 10 days later. Or you can shake the
tree and have a sheet on the ground under it. The weevils will fall
where you can collect them. This should be done early in the morning
when it is coolest.