Filter Assembly Installation
With the help from a 2nd person,
it should only take about 10 minutes to install the filter slide unit. All
you need is a short, stubby phillips-head screw driver. The screws I have
provided are basically self-tapping through plastic, Kydex, or wood. Not metal.
Install the filter assembly prior to mounting your filters into the slide.
With the focuser racked
all the way in, place all three pieces of the unit together over the focuser
hole. One person should hold all three pieces tightly together with one
of the open filter holes clicked into it's position for centering over
the focuser tube. Feel, with your
finger, that the filter slide hole is centered over the focuser tube.
While the helper is firmly
holding the assembly in place, hand screw the 4 sharp screws into the
tube wall through the pre-drilled holes.
CAUTION: Be VERY careful
to not screw through the outer wall of the tube. The tips of the screws
are very sharp and will damage the finish of your tube.
-If your focuser is mounted
on wood frame, as in most truss type of dobs, one of the sets of screws
should be the proper length. Careful not to let the screw protrude out
the outside of the wood as it will mar your finish and be a sharp point.
-If you have a sonner tube
that the focuser is mounted on you can
a. Let the screw protrude
and file down the screw tip (definitely a pain and also somewhat unsightly)
b. Buy some nuts and bolts
to mount by drilling pilot holes(More work!)
Once you have all screws
place, try sliding the filter holder. If it is too tight, try loosening
the screws a very small amount to loosen the assembly. This is usually
necessary. If it is too loose you might not have held the 3 pieces tightly
enough together during the screwing process. THIS is a problem as you
will have to drill new holes into the filter assembly and re-install the
entire assembly(not good, obviously). *Make sure the filter slide catches
on the inner most notch towards the finger hole. It is important that
it is tight enough to prevent the filter slide from slipping all the way
through and falling down the tube!
No paint and a very thin layer of wax has
been placed along the edge of the slide to help reduce friction. With that
and a proper installation, the sliding action should be a smooth and easy