Just after a little help.

A no wind day has seen me cut down a fin for freestyle sailing. Cut it down and is now a carbon 17.5 cm fin.





The issue(s) i have is:
a) does anyone have or know anywhere to get a new screw plug bolt?
b) this fin was in an adapter but the "brass" screws where buggered... local shop doesnt have any. These are the two holes at front and back. Could work around by glassing into the adapter but also prefer bolts? If anyone knows where to get these help would be appreciated!! Even the local specialist crew and bolt place could not get them in for me :(
c) is 17.5cm too small-? Previously my spins have t0 been very spinny due to the 29cm fin on my FSW.... as today offers no wind any experience on the sub 20cm would be appreciated.

If anyone has spare crews and plugs happy to buy them off them...

Appreciate any help or assistance