The original 1981 vintage J24 stuff was Navtec and BULLET PROOF and the 2009 cost was absurd at over 150 just per turnbuckle X 6
still not sure why i changed them BUT i felt a lot safer this year
Which is why everybody i know goes with the open body forged bronze interesting enough the rigging company advised against Ronstan calibrated turnbuckles on boats that were wet sailed due the the crevice issue