Roy, if you punched before, there is no need to drill. I used a sewing pin that is about 2-3 ins long with a big white blob at the top.
Once you remove the retaining ring, remove the sealing gasket, then the poppet, paying attention to which end is UP and then remove the spring...you can lift up using the pin. You will notice two slots going down on opposite sides of the tunnel. Soak up the ink in the tunnel with a paper towel. You will use the pin to go down the slot. When it stops, note the depth. You will punch through about 1/8" further but to the left and right side of the slot. I use the slot and I punch diagonally left and right of the slot at the bottom of each side of the slot. I punch four holes but I think two is enough. I would rather not drill for fear of the shavings and the pin punch is so much easier. You will be done in less time than it takes to install the drill bit. When reassembling, check to make sure that the sealing ring is hooked back on and lays flat. It takes about 2-3 mins to complete the operation.
Another reason to remove the ring is that if the punching pin is too wide, it will distort the edge of the poppet valve. This can cause the valve to leak when the cart is removed from the printer. By taking it apart, it keeps everything in perfect condition and the perfect seal is retained even when removed from the printer.
Once you remove the retaining ring, remove the sealing gasket, then the poppet, paying attention to which end is UP and then remove the spring...you can lift up using the pin. You will notice two slots going down on opposite sides of the tunnel. Soak up the ink in the tunnel with a paper towel. You will use the pin to go down the slot. When it stops, note the depth. You will punch through about 1/8" further but to the left and right side of the slot. I use the slot and I punch diagonally left and right of the slot at the bottom of each side of the slot. I punch four holes but I think two is enough. I would rather not drill for fear of the shavings and the pin punch is so much easier. You will be done in less time than it takes to install the drill bit. When reassembling, check to make sure that the sealing ring is hooked back on and lays flat. It takes about 2-3 mins to complete the operation.
Another reason to remove the ring is that if the punching pin is too wide, it will distort the edge of the poppet valve. This can cause the valve to leak when the cart is removed from the printer. By taking it apart, it keeps everything in perfect condition and the perfect seal is retained even when removed from the printer.