Hi Rob2613,
I’ve only had the machine a few months now, but it has been great. I have had it easily punch through 6mm of veg tan and certain it’s capable of more (you have likely seen related YouTube videos. I have also run it effortlessly through multiple layers of dense nylon webbing. Two things I did which were simple but really helpful were to swap the needle plate and feed dog for “non-binding” work. These are parts 17089a and 17565. Links below for parts list. The original binding plate, feed dog and feet left marks on leather. If your materials won’t take a mark, like nylon webbing, this might not be a problem. I purchased the parts from kwokhing .com in Hong Kong along with some additional feet for different purposes. Second thing I did was to tap two holes on the back of the machine and mount a.suspended edge guide. Also bought at kwokhing, but they are easily available everywhere.
http://www.seiko-sewing.co.jp/wp-content/uploads/2016/10/PARTS_LSC-8B-1_8BL-1_8BV-1_1.pdf
http://www.seiko-sewing.co.jp/wp-content/uploads/2016/10/PARTS_LSC-8B-1_8BL-1_8BV-1_2.pdf
And manual
http://www.supsew.com/download/Seiko/Seiko LSC Instruction Manual.pdf
happy to answer any other questions. Good luck