#2,258 in Industrial & Scientific
Reddit mentions of uxcell Knurled Thumb Nuts - M3 Round Knobs with - Zinc Plating - Pack of 10
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Reddit mentions: 1
We found 1 Reddit mentions of uxcell Knurled Thumb Nuts - M3 Round Knobs with - Zinc Plating - Pack of 10. Here are the top ones.
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- [Knurled Thumb Nuts] - Thread Size: M3; Pitch: 0.5mm
- [Size] - 11mm x 7mm/0.43" x 0.28"(D*H)
- [Material] - Made of iron material that is high hardness, no rust and perfect corrosion resistance.
- [Easy to Use] - This nut with knurled surface that can be easily tightened, assembled and disassembled by hand without any tools.
- [Application] - Commonly found on 3D printer beds, machine tools, cabinets, toolboxes, great for crafting projects and things that require quick adjustments.
Features:
Specs:
| Height | 1.57 Inches |
| Length | 2.36 Inches |
| Size | M3 |
| Width | 1.97 Inches |
Second on Augustus' recommend of 1800 Destiny-- they have some pretty affordable spider+holder options in the $35 range that use M3 threaded rods, rather than thin vanes -- they're a little thicker, but will make a world of difference in making it easy to center the secondary, providing a solid mounting.
On one of my smaller project scopes, I used an inexpensive 3 vane 1800 Destiny spider with M3 threaded rods to hold the secondary, keeping it centered and nice and tight. I used a hacksaw to cut off the excess rod so that it's not sticking out too much.
You can see it in a recent build thread I shared last night:
https://imgur.com/a/35LET6w
If you look at the secondary assembly above, I have nuts on the inside of the tube, attached to the threaded m3 rod, and nuts on the outside. I'll likely change the outside fastener from regular nuts to knurled thumb nuts, like these-- https://www.amazon.com/uxcell-Knurled-Thumb-Collar-Plating/dp/B07LFSNNSK which only cost a few bucks and make it much easier to adjust and center the assembly (loosen the inner nut to create room for movement, and then tighten or loosen the thumb nuts until the secondary is perfectly centered in the tube). Once set, it usually doesn't become undone, but having thumb nuts makes it easier to make small adjustments and fine tuning at the eyepiece, to ensure perfect centering and even illumination of the primary mirror.