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PostPosted: Sat Apr 13, 2013 7:54 pm 
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Joined: Sun Apr 26, 2009 9:22 am
Posts: 21
Location: Shalimar FL
The area under the set screw on my mirage drive spine cracked. The set screw lands on a flat on the shaft for the fins. The dealer said the spine is only around $20 (US), but since my fin shaft had already slipped out of place twice due to the screw backing out, I opted for what I think may be a better solution:
Image

I drilled holes through the shaft and spine, and I sawed off half of the threads for the set screw. Here is the final product:

Image

Image

That's a 4-40 UNC stainless screw with a self locking nut in a 7/64 inch thru hole. The fix has been working great. See my web site at the link below if you would like more details.

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Last edited by Surfoos on Sat Apr 13, 2013 8:22 pm, edited 1 time in total.

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PostPosted: Sat Apr 13, 2013 8:20 pm 
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Joined: Tue Apr 13, 2010 10:07 pm
Posts: 169
Exellent repair - I too have had problems in this area.

Hobie engineers please take note


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PostPosted: Sun Apr 14, 2013 9:47 am 
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Joined: Sun Apr 26, 2009 9:22 am
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Location: Shalimar FL
davew wrote:

Hobie engineers please take note


True...a metal set screw in plastic threads pushing on an immovable steel part causing permanent strain in a thinned area of plastic under cyclic loading... I suspect it will not age well. A screw in double shear is usually a preferred connection. Maybe they were worried about corrosion of small parts, parts count, or the need for another tool (a #1 small cross point screwdriver).

This fix may have been easier than replacing the spine. I just punched the fin shaft out, drilled, then hammered it back in. Did not mess with the cables or the idler pulley. The process I feared was drilling through the stainless steel shaft. All I had was a hand drill (no press). Turned out, with a little oil and a sharp bit, it only took a few minutes of drilling.

Another tid-bit: The drive started clicking when the set screw came loose. I doubt it was the sound of the loose set screw tapping the flat on the shaft - I usually blame clicking on the cable to gear teeth alignment - but the drive does seem to operate more smoothly now. If I were a Hobie engineer I would consider purposefully loosening the set screw a turn or two and see if it causes clicking. That clicking sound is so annoying.

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PostPosted: Mon Apr 15, 2013 4:59 am 
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Joined: Thu Aug 16, 2007 2:25 pm
Posts: 1870
Location: Central Coast NSW Australia
Nice fix. 8)
Should be in the 'Repairs/Problems' section.


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PostPosted: Mon Apr 15, 2013 1:38 pm 
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The shaft also needs a screw driver slot at the ends to allow alignment adjustment.


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PostPosted: Mon Apr 15, 2013 5:17 pm 
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Joined: Sun Sep 14, 2008 9:09 pm
Posts: 165
Location: Sayville, NY
davew wrote:
The shaft also needs a screw driver slot at the ends to allow alignment adjustment.


That's a great, simple idea. Certainly would make aligning the shaft when
re-assembling a lot easier.

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