III - Scope support

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Between two house-shaped pieces (J) rides a semicircular piece (K). These made of particle board. The house-shaped pieces are mounted in the center of the main disk (I). I clamp the 3 pieces (JKJ) together, and then glue and screw pieces (J) to the circle. This ensures there is a good friction fit. The semicircular piece will support the 3/4"x3.5" pine board, on which on one end the scope, and on the other end the card holder are mounted. Two 2" strap hinges connect the bottom of the board to the top of the house.
gross elevation adjustment 
(ssp4_small) The board can tip up and down by about 23° It will be down in the winter and up in the summer. With the knob you can lock the thing into place. A slot is cut into the semicircle to let the threaded rod pass to the other house-shaped piece.
scope support Here is the scope support board (L). Note that in order to keep some clearance, I reversed the hinges. Also, you need to drill some holes in the board so you can reach the screws for the hinges below.

the index card holder 
(ssp5_small) On the lower end of the board (L) is the index card holder (M). It is simply a small piece of wood glued and screwed to the end of the board. Then out of strips of thin cardboard, two retainers are made such that you can slip a standard index card in place. These are carefully glued into place such that an index card can be put in easily, yet snug enough so that there is no sideways motion possible: you always want those cards in the same place.



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