Hi
I own a Cresta T132 - 3 and have had it since 1968 when it was bought new for me (at age 16!) . I love the machine and have also bought another off ebay for spares - there is one going on there now for 0.99p -
http://www.ebay.co.uk/itm/3011499500...84.m1423.l2649 - just in case you need anything.
Do you have the manual? Happy to send you a PDF if you need it.
Re the bobbin and case - occasionally you can think you've clipped it in properly and he clip and the door will close on the bobbin area but it is not really in place and moves and makes a noise, and then when you open the door and clip the bobbin case actually falls out.
You appear to have the same bobbin case as me - there were at least 2 different ones, maybe 3. There is a hole in the top that I usually feed the bobbin thread through, then balance it on the flip up catch by holding that thread and flip the catch up quickly.
I think the manual says that adds more tension on the thread, and you don't have to put it through that hole - though I nearly always do.
Will take a look at my machine and manual tomorrow and post some pics of what I mean - if I can work out how!
The machines were made in Czechsovakia by Lada by the way.
So far I have not found any bobbins from anywhere that will fit though I have not tried a class 15 bobbin. Class 66 or Elna (Swiss machine) bobbins don't fit. Nor does the one from my New Home. I will be talking with Helen Howes
http://www.helenhowes-sewingmachines.co.uk/bobbins.html at some point to see if she has any available that will fit - The type of hook is a vertical rotary in case you didn't know.