1st light with my new GT81 was very disappointing, bright stars (unfocused) displayed "wedges" in the image at 11 & 5 o'clock positions, I suspected pinched optics, reaching out to WO support they responded:

"Thank you for reaching out. The spikes you are seeing on bright stars are not due to pinched optics. This effect is actually ca

used by the collimation screws on the lens cell, which are designed to help with precise optical alignment.

If you find the spikes undesirable, you can gently loosen the screws to minimize this effect. " . . . "However, please note that this occurrence is completely normal and does not indicate any issue with the lens"

none of my other refractors display such artifacts . . . YMMV

I had contemplated purchasing a 2nd to create a side-by-side installation, given the experience with this scope - I wont be buying more WO products. . .

Also note that to use the new GT Flattener with this scope you require a spacer . . . which was not apparent at the time I purchased the flattener. . . checkout the WO product page for details

These are very well made eyepieces. Wider FOV are nice. You need a couple of these eyepieces in your toolbox. I am surprised at the good quality and experience looking through them.

It works as intended, but I ended up buying another adapter that utilizes the same thread configuration. This will be a back up ring if I get a different mounting setup.

Fits my cg5 mount perfectly

First of all, you do not have to collimate your SCT often, but if you need to do that - it’s much better to have Bob's Knobs on! Collimation is SO easier with it! <br

The motor worked as a replacement perfectly. In addition to the original motor, the gearbox output shaft has been lengthened to better seat the drive pulley. No an easy part to replace, but can be handled by anyone handy with an Allen wrench. The adjustments are tricky, so have a good handle on that also if you're going to DIY this repair.