IV. Appendix
Detail info about the used chemicals can be found here for Never Seez:
http://www.neverseezproducts.com/msds/NSPureNicSpe.pdf
http://www.neverseezproducts.com/bostik-nickel-pure.shtml
and here for Loctite 243:
http://www.loctite.sg/sea/content_data/93815_243EN.pdf
Properties of cup springs/function explanation:
Let’s remind first an unexpected property of cup springs - they are able to generate a huge load within a very short way of engaging.
In other words - tenths of a mm less or more and the tension of the spring will change dramatically.
Our cup springs work - principially - between two “working surfaces”.
That’s at the inner side the frame’s aluminium surface and at the outer the underside of the M8 washer.
So…if we use an additional washer (to protect the frame) between spring and aluminum surface we do also move the “inner working surface” a little bit to the outside.
To be more exact we move the surface for the amount of the washer’s thickness.
We must now take care to move also the “outer working surface” more outside to compensate the added washer’s thickness. Only this way we can achive a preload at the cup spring which is - not completely equal, but very similar - to that of a brandnew bike.
And that’s what the recessed washer does - the recessment’s depth has to be equal to the thickness of the additional washer below the spring.
Additional information about how to create or find the recommended parts and more details will be edited by demand.