Someone has broken the regulating screw up inside the burner of my 123. No idea who it was altho I was there and turning the screw, I didn't break it. Anyway, its broken off (part # 15690) up inside the burner (part# 15691) about 3/4". Seems i've read that someone was able to get the screw out but I can't find the info. Any ideas? No photos but here's a link to the parts catalog. https://classiccampstoves.com/threads/214 Thanks, Bob
Wish that was the case, its broken off about 3/4" inside of about a 1/8" hole and is flush with the structure down inside. Look at the link and see if that offers more of an idea for you. Thanks, Bob
I am going to have to drink on that one. The screw extractor might work. The threads might get damaged though. I wonder if one could braze a piece of stock to it.
it's going to sound like a daft idea but bung it in an ultrasonic cleaner, i have loosened all sorts using mine, the vibrations and 50/50 water vinegar seem to do the buiness, once it's loosened then you might be able to use a pointed bradawl/awl to unscrew it nothing to lose by trying it as it won't damage anything
The easi-out might work but the set up to hold the burner and control the drill bit is beyond me. And I have no ultrasonic apparatus. And how one would braze inside of another structure is beyond my ability also. Easi-out might be the simplest. I thought someone on here had done something similar but can't find the topic. Thanks, Bob
could use a trick ive used on other small screws that have broken on me would work well on brass - place the burner etc. in a vise and place a appropriately small flathead steel screw drive centered on the broken shaft. now - whack it with a hammer! the idea is to make a slot in the broken shaft that you can then use the screwdriver to back it out with. May have to sharpen the screwdrive a bit to make it bite into the brass but it sounds worth a shot
I like bolexguys idea! Darn now I wish I had that fettling challenge. I just checked to see if I had a spare 123 but only a primus 71. Which could work but not the same. Jeff
I think a thread extractor is the best suggestion. If you have access to a lathe (or know someone who could do the job for you) then you could make a drill guide to protect the threads in the regulator. This could be a simple sleeve with an OD that matches the threaded hole and an ID made with the drill you intend to use or it might be possible to use a portion of the broken spindle (the threaded bit that came out - this would be the ideal approach) drilled out. The procedure then would be - insert the guide, drill the hole for the extractor then remove the guide, soak the regulator assembly with a searching release oil for a while, apply a short burst of heat (just enough to start to heat the outer layer of the assembly) and then apply the extractor. I have used this technique, successfully, in the past with broken off screws/bolts. Dave.
