Never heard of a heart bolt, speak english and describe exactly what they want, not some obscure term. How the hell can you treat this seriously if they dont write in english for us poor home builders that only have an engineering background, not a hang gliding background. GRRRRRRR.
Br a shame to miss out on this L1 thing because I dont speak slang, have no "skin? in the game .. knuckles or what...etc. For petes sake speak english, not giberish.)