I RECOMMEND the CZ-7aPro because it is WEATHERPROOF, CZ-3D is NOT!! The CZ-7aPro is MOUNTED MORE like a Straight Shaft SET-UP for More COMFORTABLE SWINGING, and the CZ-3D is NOT!! Also, they were ALL manufactured by the orig. FISHER Co., so they WILL ALL be OUT of Warranty, and YOU HAVE to Buy a USED ONE!! So,
Make sure YOU Buy from SOMEONE HIGHLY RELIABLE with an EXCELLENT REP on One of the Treasure Websites!! Better Yet, CONSIDER a CZ-70Pro (also WEATHERPROOF,
Has 4-Tone ID like CZ-3D, but manufactured AFTER CZ-7aPro with SAME Straight Shaft Style Mount!! Hope this helps, Les Robinson.