the coils may just need the sleeves replaced Clancy ( but if your going to be pulling the flippers apart you might as well do a rebuild )

chances are the coils are fine ( as far as I know the 17636 were made as protos for STTNG - but didn't go into production games)
I suppose the thing you have to be careful of is if the stronger coils are a little to strong and cause breakages on your plastics and so on


there's a few members that have STTNG  so the answers you get should be interesting