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Boiling= metal whistles collect gunk from your saliva over time. Boiling them in hot water helps loosen the gunk.
I started with a finger whistle and still feel its the best to start out with as a newer official. It gives you that extra split second to process what you see and maybe not blow an IW. As we have increased our film review over the last few years, I noticed that I just don't like how I look using it and also you have a tendency to begin signals with one hand/arm because the other one has the whistle on it.
If you use a lanyard, it is best to "spit" it out after the snap.
In earlier days when the Fox 40 was coming in to use, the difference in the two sounds was distinctive. A veteran white hat recommended that every one on the crew use the same whistle as you don't want to stand out as different. I think its been proven that the Fox 40 is louder.
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