Dan, The only way I've been able to get the guide block back on track is to raise the top all the way, having your #2 square drive ready, and remove the guide rail. l
Lower the top a few inches, reinstall the block on the rail, ( this may take some help pushing the side in a bit) but just snug those lower screws. Raise the top again and finish installing all the screws. It's always worked for me.
2703 Tow Lite
Bonita Springs, Fl. &