I may have the opportunity to score some discount 16mm stock that will be 400ft, the only problem is my bolex camera only takes 100ft reels. Is there an easy way to turn the 400ft into 4 lots of 100ft or will I simply have to stick to buying 100ft reels and/or short ends? I don't fancy hand unraveling/re-raveling 400 feet of film 
Cheers

Cheers