Spikes on most golf shoes are replaceable, being attached using one of two common methods: a thread or a twist lock. Two sizes of thread are in common use, called a "large thread" and "small thread". There are two common locking systems: Q-LOK and Tri-LOK (also called "Fast Twist"). The locking systems use a plastic thread which takes only about a half turn to lock.
Stroke counters help a player keep track of the number of strokes he or she has made during a hole, an entire round, or both. The simplest devices are strings of beads, thumbwheels or "clickers" that a player advances by one after each stroke and provide a total for the player to write on their scorecard after each hole; newer variations have various degrees of computational power added and can keep score for multiple holes, total scores, and keep track of over/under par statistics. These more advanced counters are generally referred to as "electronic scorecards". Counters by themselves are allowed under strict rules, but some multi-functional devices incorporate additional banned features like rangefinders or wind gauges, and as such the entire device becomes illegal.
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