Q1: will the #882 standard field tripod work w/the etx-90at

A: For the ETX-90 you will want to use the #884 deluxe field tripod. The #882 is designed specifically for the ETX-70

Q2: Can I get a replacement locking cam for the leg on line or locally in Austin Texas and if so where at in town.

A: We ourselves do not sell them just the tripod itself. i suggest contacting Meade drectly at 800-626-3233 to see if there is somewhere local you can get them.

Q3: Wil the #882 tripod be compatible for mounting other cameras/weapons requiring the 1/4-20 threads?

A: Unfortunately,the Meade #882 Standard Field Tripod is not adaptable to cameras, weapons or optics that take the standard 1/4 x 20 mounting threads. You'll want a photo tripod like the Zhumell Professional Tripod instead. Here's the URL; just paste it into your browser's address window: http://telescopes.com/products/zhumell-professional-tripod-24851.html.

Q4: Will this mount accomodate a 8" LX 10 Scope

A: Unfortunately, the 8-inch LX10 telescope would be way too much for the Meade #882 Standard Field Tripod.