You are doing everything correctly bkay, but be gentle when moving and poking around on delicate parts. I will suggest going through all the oil points each time you work on the machine, even if it's just a few hours since the last time. Poke the swing arm / needle arm with your finger (it's not particularly delicate like some indicators can be) find all the parts that move and can benefit from oil; as you well know, there are lots of gears, joints, hinges, levers on these zigzaggers.
PB blaster should be more efficient than kerosene, most of the spray can oils should be; they are made to penetrate and losen dried up oil better than the basics. I don't know why alcohol has an advantage in cases like this, it really shouldn't, but I guess it works differently because it's somethinge else than mineral spirits. White spirit should be better at this than kerosene, but as metioned, the spray can blends are what we usually first choice when the basic oil is slow to do the job.
Last edited by Mickey2; 06-11-2017 at 03:59 PM.