I had some dowels that were a little over-sized and normally I just run a little sandpaper over them. Recently, I threw them into the microwave oven for a couple of minutes and they fit like a glove.
I Built some smaller items with cherry and I didn't want to wait weeks, months...for them to turn a nice cherry reddish, brown. I got a "Natural" light bulb and set them under the light for 24/7....turn color very nicely. I hear it's the UV rays that do the work
May you all knew about these tricks but I sure didn't.