I am a Coleman guy who is making his first foray into the paraffin world with an Optimus 96L of late 60’s vintage, so I beg you excuse my ignorance. I purchased the stove from a gentleman who got it for a hiking vacation to the Isle of Skye. When he returned to the States it got very limited use. I have no idea when it was fired last. Of course, once it was mine, I had to try it. After reading the instructions, I emptied the old fuel, rinsed the tank, and filled 1/2 full with fresh K1. I was able to light, but even after 20 min. the flame was quite yellow and no roar. I couldn’t seem to build any pressure. Disassembly revealed trashed leather. Broken down it looked like the second photo with pump shaft and large brass nut, leather cup, slotted brass leather holder, spiral “washer”, and small steel nut. I had read that the leather assembly should be able to move slightly back and forth to function properly. This one was fixed. Is this normal? Is there a diagram available showing proper assembly? NRV seems to seat when pushed and released. Thinking Julian Primus #96 Repair Kit would be step in the right direction. Thoughts?