I don't think the thread or needle are an issue, since they have been set up by the distributor, which is a well known dealer here in Belgium. Neither the leather, so far i have been practicing with scraps not thicker than 2.4mm (6oz)
I believe I may have been treading incorrectly, forgetting about the last hole on top of the needle. At least this is what happened the last time. Can't be sure what happened before. The first one was set up properly by the distributor and still snap. Any ideas?
I will go back sewing and keep you updated
Thanks so much!