Bringing a budget skywatcher to astrograph level
- fit 6 new springs (1.2mm wire for 130mm/150mm, 1.4mm for 200mm and 1.6mm for 254mm) That's three replacement springs and three extra springs using the locking screws as retainers, leaving the latter loose
- remove the 7 flexible rubber washers in the focuser and fit a paper gasket to the focus spindle plate instead or -much easier- fit a proper r&p focuser without the rubber.
- remove the primary retaining clips
- set the tube rings as far apart as reasonably possible on a Losmandy dovetail
- tie the top of the rings with 3mm wall aluminium profile. Rectangular 40mm x 20mm is ideal
- fix any guide telescope rigidly to the top rail
- to prevent lateral movement, remove the slippery sw cork and refit the mirror to the cell over double sided adhesive silicone pads to coincide with the now absent cork
- fit black electrical tape around the joint between the mirror cell and tube
- cover the closed end of the tube with an opaque black shower cap.
- line the inside of the tube with black velvet
- 130mm only: remove 11mm of the focus tube barrel; the end which is closest to the secondary.
- fit a one-piece light alloy or 3d printed polycarbonate secondary spider
- paint the edges of the secondary mirror, the exposed white inner surfaces of the mirror cell, th inner surfaces if the focuser and the protruding fasteners inside the tube matt black
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