Labtecpower wrote:Ben je een nederlander ?
I have some O-rings lying around, give some sizes and I may be able to help you.
Ja ik ben ook een Dutchman:)
Initially I am looking for 2 types of orings:
10mm outer dia, 1mm thread dia
8mm outer dia, 1 mm thread dia
In the shop they only sell 1,75 or 2,4thick thread orings. 
I experimented with Orings and found out you can costumize your own orings by cutting one and glueing it back with a smallers radius. Rapid second glue did the job. So the conclusion is that I just need 1mm thread dia orings or pref a higher outer dia such that I can customize ehm.