The original springs often used in standard mirror cells provide sometimes a counter pressure that is too low for a stable collimation. The TS stainless steel coil springs are stronger and hold even heavier mirrors e.g. with 12″.
Our TS counter pressure springs fit e.g. to:
— All GSO Newtonian and Dobsonian telescopes
— All ICS Dobsonians with red OTA
— Skywatcher Newtonian and Dobsonians
— Meade Newtonians and Dobsonians
… and many more
Remove the old spring and replace it by the TS spring. No further parts or tools are needed.
Hint for DIY constructors: the springs are made of 1.3 mm wire and have a height of 12 mm.