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A newer one than the IPL I looked in. Zamas C3M look about the same as HD. As long as screw stay were it should its all well. Tape work sometimes very well.

These carbs use same house for a large amount of variations. That hole may have some purpose in an other version of carb. Its nothing I could see in parts list. What carb model number is this? HDxxx?

This is not a engine block bolt that needs a lot of torque. Carb housing is casted so this is a bit outside housing and pretty weak, brittle and pretty narrow. Re-threading to a larger diameter hole makes it even more so. But as its a idle adjustment screw that is not under much load and that...

This is the idle screw... Not much room for contra nut.

Solder them I have tried, it has same affect as whacking thread on screw. I re-threaded and put a larger screw ( in correct shape) in a couple times. I replace housing most times as I often have spares. In rare occasion I put new carb on.

I mark were it supposed to sit and wreck one or two threads just were screw enter so it sits. It is loose as the threads are worn in carb house, most often. Not uniqe and happens on many saws with this type of idle screw, regardless of brand/size/model.