Where can I get replacement pieces for my Bushnell Sky Chief III D=60mm F=910mm model number 78-5700? I bought it for $20 at yard sale and being as this is my first telescope I did not know pieces were missing. A friend told me that the eye pieces were missing/magnifying lenes you look in, the stabalizer piece that holds it in place so you dont have to hold it, and the top scope as well. There was no manual either. Any help with this and how much is this particular telescope?