12" Big Bearings.
5" factory bearings.
factory bearings are underbalanced.
Fix with quick attach Big Bearings 12" upgrade.
factory bearings standard on many mass produced Dobsonian telescopes use
clamps and springs to fix an inherent design flaw causing balance problems.
12" Big Bearings solve this issue, improving balance, motion, giving
finer control, adding a lock mechanism for eyepiece change.
Every order is individually designed with hub hole size and spacing that
fit onto your existing small bearings. Attach the Big Bearings to the
existing small ones, install the side board supports under them, then
remove the factory"Teflon" pads to complete the upgrade; a five
minute job. Bearing Fine Tuning Guides are now
included with Big Bearings to allow friction adjustment and keep bearings
centered on the mount.
All parts included: bearings, supports, support screws, teflon, bearings
laminate, fine tuning assembly. Requires glue for laminate (contact cement),
Philips screwdriver and 3/4" longer bearings bolts.
12" bearings with carrying handle cutouts, supports and guides.
and 18" Bearings.
12" and standard 18" altitude bearings with incised channels
for fine tuning guides and sideboard supports. Both 12" and 18"
designs incorporate cutouts to allow easy lifting and carrying of your
telescope. Inside braces (shown on left bearing) are individually cut
to precisely match your telescope tube outside diameter. Choose among