| 摘要 |
An apparatus including a base formed with a central hub, with the hub including a cylindrical turn-table member rotatably mounted about the hub, with the turn-table member including a matrix of cylindrical bores directed therethrough, with each cylindrical bore cooperative with an inclined locking sphere cavity rotatably mounting a locking sphere therethrough, wherein absence of a crayon member mounted within a cylindrical receiving socket effects locking of the turn-table relative to the central hub.
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