I have just aquired a spot welder it does not have a manufacturers name on it, but on the side it has spotmatik also Made in Italy.It looks like the one featured on page 89 of the Frost booklet(it is an SIP SPOTMATIC M1).My question is, where can i obtain arms that will go into difficult places and if i cannot get arms at a resonable price is it possible to make your own. Regards Eric.