HP-65 Card Reader

[albertofenini]

Hi Massimo, Hi Geoff, it's good to hear from you guys again,
may be you guys remember me from old posts.

Well, I was wondering why tube and o-ring have different sizes when the final result must look the same, is that because of the different elastic behavior of the two materials ?

I must say that I had done some repairs with o-rings back in 2013 and now I have found the o-rings melted, is that normal after only 5 years for a calc left sitting in a drawer ?

That's why I would like to go for the silicon tube now.
Massimo do you have any links where I can buy in Italy these pieces ?

Thanks in advance to everyone
Alberto