NewHome sewing machine restoration project! (Wheelock CW11)

NewHome (Janome)sewing machine, probably about 30 years old at least. Not been used in an age and consequently the grease has gone hard and things have seized up. It sews straight stitches and I have managed to free up the reverse stitch (grease gone hard), but the zig zag is not working and the machine will need a serious strip-down to free it up.
It has got all of the accessories it came with; foot control, sewing feet etc. It does a variety of stitches once the zig zag is freed up. It has a hard plastic cover, very portable but is quite heavy (cast metal internally with plastic facings). Instruction manual too.