You've probably self- diagnosed the issue.... Best option is to get some hand-on from a local who has done the deed, or a tech counselor, or an A&P [tho last doesn't mean they've actually worked on these - Nylo is not common in Part 23].
If you're using Nylo -- not specified. If Aeroquip or Stratoflex, or teflon - there are some construction details/ techniques unique to each that can cause problems. Again, getting an experienced somebody hands-on is your best bet.
A&P; RLSA - A,G,W/S Falco F-8L
50 yrs of flight and counting
Dues paid 2017 thru 2020