Ordering Paused
Resuming January 2, 2024

Customer comments and photos.


GSO / Apertura / TPO
6" f/4 imaging Newtonian mirror cell upgrade with focal length back end extender.

 Dobsonian Mounts

Read: About Our Mounts

Standard solid
Custom solid.
Custom collapsible.

Manual setting circles: Az and Dec.
Digital setting circle installation.
Mounts for two telescopes.
Height adjustment stands

ATM Altitude and Azimuth
Bearing Parts

The Bearing Works: get everything.
Or buy individual items:
Laminate rings and strips
Teflon pads
Azimuth bolt assembly kits


Image Sharpening

Primary:Fix Turned Down Edge. 
Imaging: Remove mirror clip flare.
Aperture: Eliminate spider spikes.

Clamshell & Rotating Rings

For Dobsonian mounts
For Equatorial mounts

Standard Solid Mounts

Features, construction, materials, etc.
Does your telescope fit this mount? Ask here.
Quote and Order Form

Receive an e-mailed PayPal invoice including shipping cost and shipping date.

Your Name:
E-mail Address:
Repeat E-mail:
Shipping Zip Code:
Mount Type Choice:
See table at upper right.
Telescope Tube Circumference:
Use cloth tape measure, overlap the end.
Telescope Tube Balance Point:
1. Install heaviest eyepiece combination.
2. Add finders (optical and 1x) on tube.
3. Roll tube across broomstick for balance..
4. Mark approximate balance point with tape.
5. Measure balance point to back of tube.

Enter measurement here:

Add Setting Circles:
Special request:
Mount Type Description
SMK Standard Mount Kit
SMF Standard Mount Finished

We can mount your telescope tube in our Standard Mount within the set fitting limits if it uses any bearings like these (or others), or if it has no bearings or has tube rings.

Standard mounts are a preset design and size. For taller and/or wider sizes please see our custom solid or collapsible mounts.

Standard Solid Mounts fit telescopes with:

  • Tubes up to 13.1" outside diameter (please use a cloth tape measure).
  • Tube rings up to 13.6" outside flat to outside flat.
  • Tubes with less than 23" of swing-through room maximum. Measured from the tube's balance point to back/mirror end; see fitting requirements below.

Kits arrive rough sanded. All parts (screws, dowels, teflon, laminate) included. Screw and dowel holes all predrilled and countersunk. Requires fine sanding, paint or finish, glue bearing laminate and assembly.

Add manual setting circles.
The standard mounts includes laser inscribed 12" altitude bearings.
Photo shows our 18" altitude bearing.

Type Description
SC-AZ Azimuth Setting Circle
SC-AZ-ALT Azimuth and Altitude Setting Circle

Standard mount fitting requirements:

Maximum outside telescope tube diameter:

 Does your telescope fit this mount?
Ask here! 
Your e-mail address:
Repeat e-mail:

Telescope Tube Circumference. Use a cloth tape measure wrapped around the telescope tube at back/mirror end to obtain the circumference and enter the measurement:

Telescope Tube Balance Point. Your telescope moves up and down in "altitude" using "altitude bearings", one on each side at the telescope tube's balance point. Measure from the center point of the altitude bearing to the back edge of the telescope tube.

If your telescope tube does not have altitude bearings yet, use the balance point instructions at left in green:

Tube mounted in rings? We can add bearings if rings width flat to flat are maximum:
Maximum balance point distance (instructions in green below):

We can compute your tube's swing through room for you at right. Or use the example computation below.

Determine your balance point by having heaviest eyepiece in focuser, and all finders you use installed. Then roll the tube over a broomstick to see where it wants to balance. Measure from there to the end of the tube.

This example is a 10" outside diameter tube with 20" balance point. If your tube has a protective ring on the back end, use the ring's diameter instead.

1. Determine 1/2 the tube outside diameter: 5".
Square that number: 25.
3. Square the 20" balance point dimension: 400.
4. Sum the two squared numbers: 425.
5. Obtain square root of that sum using a calculator: 20.62".

That square root equals the minimum required swing through room for your tube.

7. Add one half inch (or more) to clear azimuth bearing nut: 21.12".
8. In this example, 21.12" fits within the allowed 23" maximum swing through room.

Cancellation policy: receive refund before 30 days of order less PayPal transaction fees.