Could anyone please tell me how to remove shelves in a credenza/sideboard/buffet that are pinned in place with just shelf bracket peg pins, and no shelf clips? I want to adjust the shelf position and there are pre-drilled holes to allow the shelves to be at different heights, however I can't figure out how to remove the shelves from their current position: pretty sure they're locked in place by shelf bracket straight peg pins, as opposed to sitting on shelf clips. I removed the back board to see if they would slide out but that obviously didn't work either...