The handouts on ties by John McCarthy and Kathryn Pruitt linked from the OT-Help 2 manual on p. 11 are now available from these links (the links in the manual are dead):

https://websites.umass.edu/comphon/files/2019/09/Knotty-ties.pdf

https://websites.umass.edu/comphon/files/2019/09/Ties-in-HS.pdf

https://websites.umass.edu/comphon/files/2019/09/Remark-on-ties-in-HS.pdf

https://websites.umass.edu/comphon/files/2019/09/Further-thoughts-on-ties.pdf