My sole interest in this is that of which if these modular lances really did exist, how did they bind together? I just want to see the binding method. I'm not sure modular lances ever existed, so if you can, please post a picture or any source at all describing their construction.
After 1 whopping whole day, I've read different accounts (but not many). When the movie "A Knight's Tale" came out years back I researched the subject for a day and I never understood how modular lances were determined to exist. I've read what you may expect; sometimes they brought their own, sometimes they were commissioned by the court, sometimes they were commissioned by the competitor on site. In none of the sources I found which even remotely suggested their provision was the actual fabrication process described (there isn't many sources online, maybe at all). If these things existed, I'd love to see how they were bound together in a manner to trust with one's own life and at the same time in a way not to injure the horse if splintering occured.
FWIW, there was an article that summed up hundreds of years of competitive jousting into basically... the best horse won. Several articles mentioned that the absolute best training method for jousting didn't involve a lance at all, but simply to train the horse to buck in stride.