Mounting a Diagonal on a Holder Now we need to attach the diagonal mirror to the diagonal holder. the two most popular ways: Using a (usually manufactured) shell-with-rim holder; Many purchased diagonal holders use a shell-with-rim mounting techniqueIn this type of holder, a wad of medical cotton is used to provide gentle pressure to press the diagonal against the rim of the shell. This type of holder requires an exact match to the size of the diagonal you are using. Some, but not all, shell-with-rim holders have adjustment slots to vary the pressure on the mirror; the one pictured has these slots. As always in mounting optics, the goal is to not 'pinch' them with undo pressure, resulting in optical aberrations. You may need to experiment with how much cotton to use - you want just enough to press the mirror against the rim, but not so much that the mirror will distort.  Slip the mirror into the shell, then put some cotton behind it, and assemble the shell to the back plate.

That's it, if you have used the right amount of cotton, you are done. Blobs of adhesive on the holder Toothpicks used as spacers Adhesive mounting is popular in many home made and some commercialWhile thick foam double-sided adhesive tape has been used with success by some people, it has been known to fail in very high heat conditions (if your scope is outside in the sun on a hot summer day). Having your diagonal mirror crash into your primary mirror is not good for either of them, so we prefer to use the same silicon sealer adhesive we use for mounting our primary mirror in our mirror cell. back and read about using fresh silicon sealer, and a clean grease free mirror on that page, as the same requirements apply to the diagonal mirror (note that if you bought a fresh tube of silicon sealer to mount your primary, you resealed it well and only a few weeks have gone by since you used it on your primary, you should be able to use it a again for your diagonal).

Figure out how to hold your diagonal holder so that the ellipticalWe clamped the rod in a soft-jawed workshop clamp (see photos). apply three small blobs of silicon sealer to the bare wood. We then laid two toothpick between the blobs to act as spacers (the smaller diagonal needs less of a gap then theNow press the diagonal into the blobs and center it on the holder. Clean up any silicon sealer that got squeezed out, and put it aside for a day to cure. Remove the toothpicks when cured - if the stick a bit because they got some siliconBest Fabric To Use For Ceiling Draping sealer on them, they should come free by first twisting them in place, then pull themHow To Clean Stinky Bath TowelsMake sure none of the toothpick remains between the mirror and the holder.Tech Companies Moving To Oakland

Should you ever need to remove the diagonal (perhaps for recoating), you can slice through the silicon sealer with dental floss or monofilament fishing line. Next we will mount the diagonal in the tube under the focuser. Previous: Build a Curved-Vane Diagonal Holder Next: Installing a Spider or Vane in the Tube Back to the Build a Dobsonian Master IndexNew Climate Control™ and Active Lifestyle Series Shades Provide Anglers With Superior Fishing Vision, Absolute Premium Protection Among the full line of sunglasses eyewear innovator Wiley X®, Inc. will display at the upcoming 2016 ICAST show (booth #1021) are four new models sure to "catch" the attention of serious fresh and saltwater fishermen across the country. Each of these new models features Wiley X's advanced Filter 8™ polarized lens technology, providing anglers with the ability to read the water and spot weedbeds, drop-offs, schools of bait and even fish hanging out under docks. One of these new styles is the bold Climate Control™ WX Boss featuring the Wiley X's patented, removable Facial Cavity™ seal to block out wind, airborne debris and reflected light while enhancing the fish-spotting benefits of Wiley X's polarized lenses.

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