nathen m3 airchime

I’ve had this horn for about 5 years and just recently it’s been freezing up at around -5 celcius, I want to take it apart to see if there is any moisture in there but cant get the allen screws out, can I warm them up without hurting it ?

soak the bolts in PbBlaster for a day or so. then try and wiggle the bolts loose. be careful, as allen bolts tend to snap at the base of the bolt head