I have an old Kenmore which is a 158 model, but not the same.
A gentlemen sent me a link to the manual. The manual is for the following models, but I was told all the 158 models were very similar:
MODEL 1340 / 1345 / 1350 / 1355 / 1358
1561/1595
If you pm me your e-mail address I can try and send the link. If that doesn't work, I can just forward the e-mail I originally received.