FastFourier
49 posts
Mar 19, 2018
8:56 AM
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I watched a video of someone opening the cover plate of a Special 20 just by banging the back end flat with a hammer. Is it necessary to first snip the corners of the reed plate (next to the supports on the back side that touch the comb)? I couldn't tell from the video whether that had been done.
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6SN7
793 posts
Mar 19, 2018
9:20 AM
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i flatten a feew ofmine a while back. I snip the corners and then used a pair of artistic wire nylon jaw pliers ( 5$ at AC Moore) to flatten the comb. it did a decent job and left no marks. good luck.
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florida-trader
1277 posts
Mar 20, 2018
5:29 AM
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How you open up a set of Special 20 covers is a matter of personal preference. If you want to get rid of the tabs at the corners, get rid of them. I use a diamond cutting wheel to grind them off. It only takes a second.
As for flatting the back of cover, I use Sheet Metal Seamers. Available at Harbor Freight for $9.99.
Sheet Metal Seamer
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Tom Halchak
Blue Moon Harmonicas
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Arrick
145 posts
Mar 20, 2018
8:47 AM
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I just hammer them over and it seems to work fine. I have an old wooden table in my studio that has the perfect radius on the edge to hammer against. My first few I really did slowly/gently. Now I just let have and get it done.
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MP
3570 posts
Mar 20, 2018
4:40 PM
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Anything like a 2"/4" wood surface that is secured will work to keep the covers from scratching. I can open one in a less than two minutes. They idea is to hit glancing blows along the edge of the flap and not hit so hard as to crease them or miss and make a dent or two into the cover plates. If that happens they are near impossible to remove. I don't remove tabs like Arrick either. Mine look exactly like the Blue Moons above. You can use a hand seamer too. You can cut the tabs. I will say that lately I don't bother opening the backs. The idea is one is supposed to get more projection or a brighter sound. I have started making closed back SP/20s and they project just fine. Sometimes it is just a matter of choice w/ certain tweaks to harps. Well, this is only my opinion but I have some experience in the topic.
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Reasonably priced Reed Replacement and tech support on Hand Made Series Hohner Diatonic Harmonicas.
'Making the world a better place, one harmonica at a time.
Click MP for more info. Aloha Mark
.
Last Edited by MP on Mar 20, 2018 4:42 PM
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Piro39
130 posts
Mar 20, 2018
11:35 PM
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What I do is make a vertical cut with a dremel cutting wheel next to the tabs being careful not to cut too far up, just to were the seam is bent on the cover plate. The tabs stay and I use the Harbor Freight hand seamer but I had the two jaw pieces cut down to the same width as the piece of cover plate that I'm bending over. The jaws are removable with two screws that hold them on. I had a sculptor friend use his drill press and a large diameter bit cut a half circle on the ends to the proper width.
Last Edited by Piro39 on Mar 20, 2018 11:38 PM
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florida-trader
1278 posts
Mar 21, 2018
8:27 AM
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Piro39 - you mean like this?
Only mine were modified with a CNC Milling Machine. Same result though.
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Tom Halchak
Blue Moon Harmonicas
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MP
3573 posts
Mar 21, 2018
2:56 PM
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Now that's a Hand seamer for SP/20s! Mine is only good for MB types. I use a lei needle and make an eyelet ala Kinya Pollard on MBs.
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Reasonably priced Reed Replacement and tech support on Hand Made Series Hohner Diatonic Harmonicas.
'Making the world a better place, one harmonica at a time.
Click MP for more info. Aloha Mark
.
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Piro39
131 posts
Mar 21, 2018
4:25 PM
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Tom, That's what I did only didn't have a CNC machine available.
Last Edited by Piro39 on Mar 21, 2018 4:25 PM
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