They were good reels in their day, and the line wrapping around the spindle was a common fault of most reels back then. Once skirted spools came along, the old Mitchells fell behind the rest. Right at the end of the 300's life in 1982 the 300S came out with a skirted spool that addressed the problem, and it was a brilliant reel, but rear drag reels were all the rage by then, and after a few more years the 300 disappeared.I hated the 300 reel l had, overated rose tinted nostalgia glasses being worn, when guys talk about this antiquated reel.
They were better than other reels for a while, but soon got left behind, mostly in sheds and lofts and car boot sales gathering dust. everytime l used mine, especially if there was a breeze blowing, the line would end up behind the spool and wrapped up around the spindle, pure dross in my opinion, mine ended its days in a skip after l took my revenge on it with a 4lb lump hammer, along with 6 spare spools in there plastic cases.