A fastener can not hold unless it is stretched. It's like a clamp. Loctite, lock washers and star washers treat the symptom but will never cure the disease. Find the socket head cap screw size on a torque chart and torque it to that value. Torque is not as good as stretch but you can't measure stretch on a blind fastener.
And don't even think about using a stainless steel screw. It will seize fast without a lubricant.

https://www.boltdepot.com/fastener-i...ed-Torque.aspx