1. Cut 3/4" Styrofoam to 5 3/4' x 3 1/2"
2. Cut 3" x 3" rubber nonskid and center on top of styrofoam.
3. Pin 1/8" ball pins on all sides of each corner to fend float away from reservoir sides.
4. Place a 3" x 3" 1st surface laser bounce mirror mirrored side up and centered on rubber nonskid.
5. Install in reservoir filled with 10mm of water then cover with clear glass wind shield.
6. Set assembled artificial horizon onto an 8" Lazy Susan for easy 180 degree rotation.
https://www.ebay.com/itm/Plastic-Spinner-Lazy-Susan-Turntable-Organizer-Spice-Table-Cake-Pantry-Display/273939076319?hash=item3fc80a94df:m:mSgqai9PcGqJIxkOz0KBmDw
https://www.ebay.com/itm/First-Surface-Mirror-3-Square-3x3-aluminized-1-8-glass-FS-FSM-front/184261133642?hash=item2ae6d1c54a:g:s5AAAOSwN81WDBDR
A precise observation requires averaging a sight both ways across floated mirror. It is recommended to split the time difference and observed altitudes of the sight pair then perform a single sight reduction. Expect intercepts no worse than 1 minute of arc.
