As indicated you can get by without the bronze or aluminum piece.
The Duckbill usually won't fit onto the oil line snug without the bronze or aluminum piece and I've seen one or two that had a solid type restrictor push down inside the oil line. I've made a adapter that the duckbill will fit onto snug by using the insulation off of a solid copper electrical wire. I just strip off about 3/8 inch of the solid copper wire insulation, (don't remember the exact size, it is a #12 or #10) and the duckbill will fit onto it snug and the oil line will stretch over the type TW electrical insulation. The saws, will not overoil without the restrictor. You may even have to use a 30W oil to get good oiling even without the restrictor.
Instead of using the really thick Stihl type bar oil I usually thin it with 50% 30 weight motor oil so as to get good oiling, especially in cold weather.
Also keep a heads up as it's really easy to get the oil lines routed bassackards when replacing at the pump and she won't oil.
Keep in mind that the oil cap must have a tight seal. (two different types of caps were used on them little darlings, a internal thread and a external thread caps. For a good seal on the external threaded caps you can use a correct size o ring on the cap. (them little cork gaskets for the caps are pricy, might have gold dust in the cork)
The Duckbill usually won't fit onto the oil line snug without the bronze or aluminum piece and I've seen one or two that had a solid type restrictor push down inside the oil line. I've made a adapter that the duckbill will fit onto snug by using the insulation off of a solid copper electrical wire. I just strip off about 3/8 inch of the solid copper wire insulation, (don't remember the exact size, it is a #12 or #10) and the duckbill will fit onto it snug and the oil line will stretch over the type TW electrical insulation. The saws, will not overoil without the restrictor. You may even have to use a 30W oil to get good oiling even without the restrictor.
Instead of using the really thick Stihl type bar oil I usually thin it with 50% 30 weight motor oil so as to get good oiling, especially in cold weather.
Also keep a heads up as it's really easy to get the oil lines routed bassackards when replacing at the pump and she won't oil.
Keep in mind that the oil cap must have a tight seal. (two different types of caps were used on them little darlings, a internal thread and a external thread caps. For a good seal on the external threaded caps you can use a correct size o ring on the cap. (them little cork gaskets for the caps are pricy, might have gold dust in the cork)