The best thing to do to fix a shenai is fix it yourself. you can save alot of money doing that instead of buying an entirely new shinai. Here are some useful links of how to tie the knots of a shinai and how to put the shinai back together and buy replacement pieces.http://www.shinai.org/housemef/shinaimaint/shinaimaint.htmlhttp://www.e-bogu.com/Shinai_s/24.htm
When you take apart the shinai make sure you sand the inside of the slots and sand of any spilters. If the splinter is more of a crack the shinai can not be fix. Even so keep it so you can use if for parts to fix other shinais.
Lastly a good thing to do is to put oil on the shinai. It makes it shiny and look new. There are special shinai oils that you can buy but canola oil or veggie oil work just as good.
(its sorta like healing a tree branch with sap)