Ok
You may have been having the same problem before the NSS change and thought it was NSS, as most starter sol. probs are intermittent..
The lamp test will tell...

Also, a cheap trick we use that sometimes works when one has a weak solinoid/contactor bar in the starter is to jump the car with a set of jumper cables from another battery/car.. this sometimes , due to the added bat power, is enough to overcome a poor interior starter contact and will get the thing to kick... only works once in a while , but beats getting down there and only takes a min. to try......not a diagnostic thing , just a trick that sometimes works..