I have several Hohner MBs. I want to seal the wood combs and thought I may as well convert them from nails to screws/nuts while I'm at it. My questions are, what size screws/nuts do I need for the reedplates/cover plates, and where do I get them?
Thanks in advance. I don't post much, because the more I reed/less I post, the less likely I am to say/do something to get myself banned.
0-80 screws will do the trick. They are awfully tiny. The hardware store didn't have them but I finally found them at a model train hardware store. You can get a tap set for drilling it out, but I don't have the numbers for that off the top of my head. You can look it up using the screw size though.
M2 screws fit nicely. 10 mm is also the perfect length for the coverplates. 3/8 of an inch is just too short and longer that that in imperial measurements stick out too much. 10 mm fastens just flush with the nut.
You can also use the M2X10mm screws for the reedplates. You can use nuts or you can tap the opposite reedplate to make it simpler to reassemble. If you have lots of harps to do, it's cheaper in the long run to tap since the nuts are more expensive than the screws.
I order from Microfasteners.com:
Nuts: http://www.microfasteners.com/catalog/products/METHNM.cfm HNMS020 50 M2 x .4mm Stainless $ 2.90
In the states, size 2-56 bolts are an all around good harmonica size. I use them to replace both the reedplate nails and the coverplate attachment nails too. In a pinch you can always find them at your local radioshack (2-56 nuts too), as this is the size of bolt used to attach many circuit boards in DIY electronics. They only sell slotted heads though. I use a 2-56 tap to tap the holes I drill in the reedplates. You can get a 2-56 size tap at ACE hardware. I can't remember the drill sizes I use, but I use two sizes: one that's a little larger diameter than the 2-56 bolts and one that's a little smaller. I use the smaller for the draw reedplates where I am going to tap the holes, and I use the larger for the blow reedplates and the coverplate bolts where I want full clearance for the bolts to slide in.
0-80 bolts are good for replacing reeds, but I think that they are too skinny for good reedplate securing.
For reedplates I like my bolts to be 3/8" to 1/2" long. 3/8" stand just a little proud of the reedplate, and 1/2" sticks way proud. The 1/2" bolts can be configure so that they act as coverplate supports (eg. two facing up, and one down). 3/8" is just a little too short for attaching the coverplates using a standard 2-56 nut, so I use 1/2". There isn't TOO much of the bolt standing proud above the nut, but there is a little. For the 0-80 reed replacement screws, 1/8" is what you want, or else you'll have to really cut and then sand the end of the bolt flush with the bottom of the reedplate...
I know this is an old thread, but I just now noticed something in Baker's videos. Do you always take your pants off to do videos? I noticed them hanging behind you in vid #11. Does that help you breathe better? LOL
That is my video Bee...I put those up around 3 years ago. They are the basics for tinkering with a harp and serve the purpose of getting folks to experiment a little - the responses have been positive and players seem to like the simple instructions. The 1st vid has over 11,000 views, so it's getting around one way or another - I don't promote them at all :) ---------- The Centipide Saloon Tip Your Waiter Please
Last Edited by Frank on Dec 23, 2013 7:25 AM
I’m a little surprised that nobody has mentioned 1-72’s as an option. That’s what I use. I find that the 0-80’s are a little too small for my taste and the 2-56’s are a little wide to use as reed plate screws. I try my best not to use nuts by tapping the draw plates. Sometimes it is unavoidable. Typically a hole is drilled between the base of the 2 and 3 draw reeds. There isn’t a lot of meat on the bone in that area. The head on a 2-56 is almost too big to fit in that space and not interfere with the reed pads. Almost. A 1-72 is perfect. And 1-72’s are readily available at most of the online stores for about $5.00 for a package of 100. The nuts cost the same. I get mine from MicroFastener.com
The screws for the cover plates are a different story. I could see using 2-56’s for that but I prefer binding screws. These are the kind found on MS harps, Marine Band Deluxe & Crossover, Seydels and Suzukis. They are not as easy to find and are much more expensive. You can get them off the Seydel website if you look for parts for the 1847. In my opinion, they give a harp a nice finished look.
---------- Tom Halchak www.BlueMoonHarmonicas.com
Last Edited by florida-trader on Dec 23, 2013 1:51 PM