Well, I am new here but have a few older machines and if I am not mistaken you can just stick a little piece of cotton batting in there and then oil it. If I am wrong hopefully someone will correct me and give us both the right answer.
I have the following machines: Free No 5 treadle, Davis VF2 one treadle and one electric (but now treadle), Singer 99 electric, and 15-91 electric. I recently sold a Singer 127 handcrank (or 128 I get them confused). I have to fight the urge to buy old machines when I see them, but lack of space helps control that.
BTW, can someone tell me how to date the DVFs?
Thanks,
Jp