I have an SPF GT40 and I’m replacing the dim bulbs in all the instruments with LED’s. I hoping to not have to remove the dash but so far it’s been very difficult to get at the back of the instruments. Getting the dashes center switches out of the way would help so I started to remove the switches from the plastic surround. Everything was going great until I got to the Wiper switch. Unlike the Fan switch which had a set screw holding the knob on I’m so far unable to figure out how to remove the Wiper switch knob. I assuming it pulls off but I don’t want to break it. I’ve pulled pretty hard and so far nothing. If someone else has done this please let me know how it comes off. I tried backing off the nut but that just managed to thread the lower part of the knob shank.