Just tried the search function here and found nothing after finding every vendor I could who offered a 14x1 LH to 24 x 1.5 RH thread adapter... any recommendations for a vendor that has these in stock?  I want to put a > AK 74 style brake on my AK with 14 x 1 LH threads and was looking at the brake from CNC Warrior - > http://www.cncwarrior.com/Bulgarian-Type74-Brake-p/22041.htm

They are out of stock in the above adapter...

Try here.
https://www.amazon.com/Sports-Adaptor-14X1-mm-Threads-24X1-5-mm/dp/B006Z919X2
or here
https://www.usmachinegun.com/products.php?cat=78

If your AK is 7.62 you will need to enlarge the hole in the end of the muzzle brake.
Not doing so could cause serious problems.