Yep they snap out easy, with just your finger nail as a pry bar
all one unit clock with a one battery in it..with a small plastic knob to set the time..some have a stem on the side of the face like a pocket watch..but very small and short..
The high end ones have knobs that unscrew from the clock and you can drill a small hole for them on the back side
neat and clean
I have in the pass use the cap off a spray can of paint ( clear cap type) cut it down a bit for a good dust cover on the back side..(for 3/8" thick to 5/8" thick stock)
Great to have a ton of stock on had, small tip find a mate or a lumber yard to mill the wood for now, you will be money ahead of the game.
I can not knock the way Bob and Rick make the clock but I will tell you how I make them
I start with long stock,put the 30 deg. cut on both ends then put in the slots,then cut it into two parts, line the parts up so the edges are the same then put masking tape on the two parts and rip the parts at the same time to get it a matched set, then put the pocket hole in for the clock on dead center,,then use a 1/8" round over on the edges.glue and clamp if needed and then use the trim bit to remove the proud pins,sand,seal,finish coat, pop in the clock and give it away