thank you both for answers!
I will sure buy "Iron Time", I have been thinking about it for quite some time... however the prices vary quite a lot (some dealers offer it for double the price as others) and therefore I was still waiting with hope of finding a cheaper one
I currently do not have the cable that connects the camera with PC (or, in fact I have it, but it does not work) so I cannot post any pics at this time...
This is what I was thinking about (or in fact hoping for) - that it could be pre-TR example later mounted together with the H.Cross.
It is 42mm in width, with no maker marks