I got tired of problems with bent pricker needles on my Primus 1001 "blue hat". After yet another procedure of straightening pricker's wire I looked closely onto root-cause of the problem. Obviously it is the pricker rod which is "wobbly" in its upwards movement. That causes the pricker to be sometimes off-centre when it should enter the jet. Not much to be done with "wobbliness" - I don't have spare parts to rebuild this assembly. But upon looking closer on Primus jet (modern replacement) I notice that they have a flat area, plateau, which is trapping the needle if not perfectly centred. Below is a close-up of Primus jet's inside: Compared to Optimus jet (left below) one can see the plateau in Primus: Why do they do it like that is beyond me, probably something with saving production costs. I'm not sure if original Primus parts also have this flat surface. To cure the problem one takes the biggest drill bit which can go into the opening. In this case it is D=4mm drill. Below you can see that the plateau is gone: drill's cutting surface is making nice dome inside the jet. What is left is to polish "the dome" to remove burrs. I do it by applying drill at high speed but with just very lightly handheld jet. This takes care of all burrs. Due to wide drill this procedure does not affect the jet opening at all - the drill never reaches the small cavity with jet. I reassembled the lantern and lighted it. All is as normal, light level is the same, no flames etc. Only that now I can safely use the pricker to clean the jet. No more straightening of this tiny wire! I hope that helps you guys.