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Can't speak to your iExos-100 problem specifically (cos' I don't have one), but as to WD-40 as a gear lube...
No..no..no.... It's good for lots of things (just like duct tape), but a grease substitute it's not. Heck, I use it to clean the grease OFF my gears when I'm servicing my mount.
Here's the thing. Worm gears tend to wipe the grease off their teeth as they work. You want something sticky enough to resist that over time. I think my mount came with a lithium grease on its worm. I replaced that with LiquiMoly + MnS02 (basically, ball joint grease). Messy, but tenacious. Some here like Superlube + Teflon. Other candidates as well. Lots of vigorous debate on what's best for a grease, but I think we'd all agree that WD-40 is not a good choice for that application.
On Tue, Dec 29, 2020, at 16:28, yarbroughrix@... wrote:
Mounts: ES PMC-8 EXOS2
Scopes: SV 102EDT, ZWO 60/280 Guide
Cameras: Nikon D5300, Altair GPCAM2 290M
Software: ASCOM, CdC, AstroTortilla, BYN Pro, Sharpcap, PHD2
Computer: Thinkpad x230, Win7Pro/64