I never would have believed it if I read it on this forum but it is the honest truth. I put a Hoover White Cap on a Feadog sop D whistle tube and it is the most perfect whistle I have ever played. The breath requirements are the same all the way into the 3rd octave. It is loud, pure, sweet, clear, and fast. There are no squawks, squeeks or anything to detract from the pure pleasure of playing. I have seven different Susato’s, an O’Brien sop D, Tony Dixon sop D, Jerry Freeman tweaked Mellow Dog, Syn sop D, Clare sop D, Alba low D, Alba low C, and Kerry low D. This inexpensive Hoover/Feadog whistle beats every one of them. This just goes to show that you don’t have to spend a fortune to get a superior sound. Now I know that none of the whistles I have are what you would consider real High End like Overton, Copeland, Chieftain, Burke, etc. I am negotiating to buy an Overton now but I will be surprised if it is actually better than the cheap-o whistle I have described. I have tried my hand at tweaking a whistle myself with very limited results. Have any of you transformed a whistle in this way? I’m curious.
Mack Hoover’s instruments are always quality pieces! Enjoy! 
I have a Hoover white cap on a Walton brass body. Great whistle. For those looking for champagne on a beer budget, this is close, real close.
A White Cap is a treasure. I put a White Cap on an Oak body (the original fipple had shattered), and it was a lovely whistle. I also have a White Cap on a body Mack made that sits right next to my computer…it’s a delight.
Redwolf
Now that I think about it, I’ve never heard a bad word about Mack’s instruments. Ever.
I have a Whitecap on an Eb Generation body. It turned a hound-dog into a champion!
[Here is my web page with my visit to Mack's workshop in Clifton, Colorado](http://www.geocities.com/whistleandsqueak/hoover.html). Mack puts a lot of work and care into each whistle. Most of the process that I documented is the same as how he makes a Whitecap, since the fipple construction is mostly the same as his CPVC whistles.Mark
I put a whitecap on a clare two piece body, and it is one of my favorite whistles now. It playes great, and can fit in my pocket. Also, Mack is a great guy to deal with.
Okay, here goes. Mack Hoover makes damn good whistles.
I have a couple of his whistles and a White Cap on a Walton tube. I was getting very frustrated with the second octave on my “cheap” whistles but the White Cap makes all the difference. The second octave is easy to reach and doesn’t sound like a train trying to stop. In fact, it sounds pretty good, even for a tyro like me. The other Hoovers that I have are real quiet, good for late night practice and definitely help develop breath control. But the White Cap/Walton is the one next to my computer.
I would say to a beginner looking to step up from a first whistle that Mack’s work deserves serious consideration.
Yeah, that too.
Roger
There you have it Mack. You turned my bad-dog Feadog into a Lapdog and I can see that I am not the only one your work has touched. My hat is off to you, buddy.
I just did the same to my nickel Feadog. What a difference. Looks cool too.
I guess I was unlucky. I put a whitcap on top of an Oak body and it was impossible to play in public. All buzzes and squawks. It was good to practice on because it was so hard to control I recently tried the hairspray tweak and it made it a lot easier to play. Mack’s whistles, from what I’ve seen, are not for session playing, unless you’re accompanying a dolcimer. Very quiet.
I got a Whitecap on an Oak it is very nice.
Whitmore,
Mack’s whistles are definitely quiet. Depends on how and where you play them. I have three of his whistles that I really like, and the Whitecap on the Gen Eb has good volume (probably attenuates the Gen Eb’s shrillness). I did play a low D that was just too quiet for my taste and use, and passed it along to another whistler.
Regarding the Whitecap on the Oak, did you contact Mack about the problems you were having? He’s very responsive to his customers.
Mark
I have three Whitecaps and they all sound different on different tubes. It took a long while to find the best tube for each head.
But one of them is my favorite indoor whistle!
Yup. Mack is a good guy.
Markbell, no I didn’t contact Mack. I assumed this is how they all are. In fact I assumed that for over a year until I played one that Wanderer has. It was 100% better. The hairspray did make a huge difference to mine though and I now use that whistle regularly now.
I have two D whitecaps, one of his old design, one of the new.
His old design plays and sounds much like a Burke, very sweet, very mellow whistle, lovely to play and hear.
His new design has more backpressure and can be played very aggresively if you like that, plus it still has that sweet, singing sound and lovely, easy high octave.
He makes wonderful whistles.
–James
I had Mack make me a quiter than usual Whitecap. I wanted it extra quiet for practicing in hotel rooms. It has all the glowing attributes mentioned above. It does clog more quickly than my other whistles but Mack made it clear in the beginning that would be the trade-off to get a very quite whistle. I hardly play anything else now even when I’m not in a hotel.
Just adding my voice to agree with the positive things said about the Whitecap.
My whitecap arrived today and I’m astounded at what it does. I played it on my Feadog, Generation and a couple others. Can’t believe the difference–especially with the Feadog and the Generation whistles. The second octave in particular is worlds ahead on this one.
The Whitecap is a great mouthpiece to be sure. It does what it is designed to do, and consistent in doing that! Mack is a generous man, and it’s good to see that he has blessed many people with his talent!
Huh. I must have the old version (which I love), because when I get too aggressive, it tends to squeak.
Is there any way I can tell for sure? Do the new whitecaps start at a certain number, or did Mack start
over with the numbering when he changed designs?