on parts interchanging. on this machine there was a problem of it changing stitch length, and the lever not moving, plus ever once in a while it would bind. I found that in the column at the stitch length lever/rod. and at the slider, the square pivot ( bearing ? ) would try to walk out of the channel it slides in. at that point the bearing ( ?) would get very sloppy. did some adjusting which make thing not so great.
I have an old 15 clone, so I took all those parts from that machine and they now live in this one. There a direct fit, The difference was, a better quality steel, larger wear surfaces and a longer pivot post for that bearing.
the japanese clone was all heat treated fasteners , the Ph machine is all mild steel fasteners
The donor is a occupied japan machine ( 1947 to 54) this one is made in Philippines (?) and made after 1959
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