While I like the caster plates, if it's a one time deal and you just want to bolt them on, take your caster and wood and measure carefully how long the bolt has to be. Most casters I've seen have enough room for the bolt to hang down the thickness of the nut plus a little more no problem. Buy bolts that are the closest fit you can get. If the bolts are too long use little squares of
luan as spacers to decrease the amount of bolt sticking through.
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