yep, need a larger sized needle on long arms vs domestic machines. On my Bernina's and Viking's, I tend to use whatever needle is on my machine at the time which actually is an 80 universal as I purchased a box of 100 of them a while back and normally would be using sofine 50 or aurfil 50 as my thread. On my long arm my default needle is a 4.0 which is also known as a 110 or a size 18 depending on what numbering system you are using; I generally am using soFine 50 as the thread.