I got the oilers working on the 1-70 & the 1-75.Some clown on FB told me that I had to take the tank handle off in order to fix 'em,not true.I had to take the 4 bolts out that hold the tank on & the 2 bottom bolts for the front handle.First I did a practice run on the seized 1-70 so I knew what I'd be expecting on the other saws.Boy,that seized 1-70 must've been left outside for quite a while,that plunger piston was seized in there pretty good,but I got it freed up.I don't know if that piston is any good - rust all around it.
Then I moved on to the good 1-70.I pulled the tank off that saw & that plunger piston was seized too.I used some WD40 & tapped it down & it broke free.I put it back together & it oils great.
Next was the 1-75,this was the easiest fix I ever had.Something told me to try it before I tore it apart,I did & it started working just fine.I tried that oiler several times & it was stuck.That time it broke free & started oiling just fine.
Now the only thing left is to pull the carb off the 1-70 & rebuild it.It's got a Tilly HL19D.