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Accessories - Bob's Knobs Collimation Knobs For Meade Lightbridge, Apertura, GSO 8" F/6 Primary

Bob's Knobs Collimation Knobs for Meade Lightbridge, Apertura, GSO 8" f/6 Primary

Bob's Knobs
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Estimated Arrival: Between Oct 07 and Oct 13. *ETA to USA Only

Shipping & Returns: Satisfaction guaranteed 30 day return policy.


We offer knobs for the Meade Lightbridge, Apertura, and GSO primary and secondary, along with stronger springs to support the primary mirror. Select the type of knobs/springs for your telescope from the list below. Price is for a complete set of knobs.

Fits: Meade Lightbridge, Apertura, and GSO 8” (20 cm) f/6 telescopes with factory collimation screws. Will not fit scopes with factory collimation knobs.


  1. If your primary looks different from our photograph, or already has factory collimation knobs, these knobs will not fit.
  2. The telescope optical tube assembly will clear the rocker box with primary knobs installed.
  3. Primary adjustment knobs are slightly larger than shown in the photograph and do not have an orange insert.


Primary Collimation


Black plastic, 30mm (1 1/4”) diameter, 5-point fluted


Plated steel

Primary Lock


Black plastic, 25mm (1”) diameter, knurled


Stainless steel


We know that once you've placed your order, you are anxious to receive it! We make every effort to get your order shipped out to you as quickly as possible.

As soon as you place your order, you will receive an order confirmation e-mail. This means that we have received your order in our system and pre-authorized your credit card for the purchase. We will process the charges to your credit card and your order will ship within five business days from the date of your order. We will send you tracking information within 24 hours of your order leaving the warehouse to the e-mail address you provided when checking out.  If you do not receive tracking information from us within six business days of your order, feel free to follow up with us at

Standard shipping time in the US is between 3-5 business days, though it can vary slightly depending on the destination. We typically For updates on your shipment you can enter your tracking number here.

We distribute nationwide via UPS and Fedex. Unfortunately, at this time we are not able to provide expedited or international shipping.