Thank you :) The first tension assembly is the pre-tensioner which is part of the thread path and has to be used. The other main tension assembly can be used if you are changing thread types and thicknesses so you don't have to change the primary tension, quite handy to have two of them for when you want to use other sizes of thread.

Yes there is @richyjames1378, we just haven't got one in yet to play with but our supplier does make a few options :)