25mm to XXmm Base Expanders

To rebase or not to rebase...
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I do not particularly like the look of gluing a smaller base on top of a larger base; even if you add scenic elements to hide the old base, the added height just doesn't look right (not to mention that changes the line of sight by an additional 3.5mm; although cover saves are now shorter by 3.5mm - lol)
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When you somehow managed to accumulate a bag of 400 or so older 25mm bases around it doesn't hurt to repurpose them to the slightly larger base size as n