With recent impulses (serial numbers after around 11000) there is no grub screw under the body to remove or replace. Just remove the front cap and the silver plug on the front of the body with a 3/16" allen key and a bit of brute force. Clean the threads of the hole you took the plug out of, to ensure there is no old loctite on them, then put the tapeworm (with well-greased o-rings) into the hole and screw it in. Loctite is not necessary to hold it in place or seal it.
If you're following the current version of the instructions on the SP web site, you only need to follow steps 2,3,4 and 5.