OK got my 180-C right here..
first you have to take out the name ring form the filter threads. I use a rubber no-hub cap jsut smaller than the lens front. That will also double to get the front cell out as well. You can also use even presure of your thumbs, wear rubber gloves to give you more purchase.. a bottle cap rubber sheet... get inventive n use your imagination but it has to come off.
*****a tip.. if you unscrew the front cone by grabbibng the lens n turning it... that will take the preasure off the name plate n make it easier to get out.
Once it's out.. you'll see the front cell in the center.. it has 2 notches on the sides for a spanner tool. You cna again use the rubber plug or even preasure on the rim.. 2 screwdrtivers one on each side.. I sometimes use a large c-clip pliers... or hemostat.. but most times it comes out by using my fingers or the rubber plug. It;s in there tight but once you break it loose initicallyu, it unscrews like a light bulb.
******Sometimes it is possable to unscrew the cone and by jamming a rubber bottle cap sheet in there as you pull up on it n turn the entire thing, it will have plenty of grip n come right up for ya.
After the front cell is out you can unscrew the cone the cell was sitting in.
Once you get that out we can go on... the rest is easy.. alot easier.