Springs instead of rubber O-Rings in Push-Pull collimation system - SW 8" Dob

[amaury]

Hi all,

Do you guys bother changing the rubber O-rings that come in some primary collimation schemes with springs? or just with thicker o-rings?

I feel the factory o-rings that come with the 8" SW Dob are so thin that they barely do anything to support. 

This is the only thread I've come across where this matter is discussed explicitly. 

https://www.cloudynights.com/topic/542406-skywatcher-8-dobsonian-collimation-where-are-the-screws/?hl=+skywatcher++mirror++cell#entry7307925

Sketch of the push pull system with rubber piece. 

Sketch taken from: https://www.cloudynights.com/topic/427605-disk-vs-coil-springs-for-loading-adjustment-bolts/