Is the S2 gear linkage supposed to have a gaiter around it where it passed through the diaphragm panel at the back of the chassis? I can't see any mention of one on the parts manual and it wouldn't actually keep all the debris from getting inside but I thought there might have been something there to keep the bigger stuff out.
Not to contradict Dakazman....but, yes, it was supposed to have a gaiter; it was a modified/repurposed Elan shift lever boot. The top of the boot is cut off and used to finish the europa shift lever boot (they come without the ball at the top.) Cut the two apart where the red arrow is pointing.
You then use a GOOD contact cement around the inside of the hole, on top of the mounting flange on the rubber boot, push the front shift rod thru the hole in the boot with the bellows pointing to the rear, push it thru the big hole, and then attach. Alternatively, pull off the big bung on the front of the cross member, feed both thru the center, grab with your hand thru the oval opening on top, and guide back to assemble and glue the bellows onto the back of the frame. You can figure it out if you're at this stage.. Smear some lube on the tube where it goes thru the gaiter and it will be good to go.
Lotus did a lot of sketchy things, but leaving holes open and unfinished was not SOP.
See the photo.