Are you talking about the black plastic holding device that needs to be engaged when putting the awning in storage position? If so, I've had that same problem; struggling to get them to engage. Then I accidentally found something that helps. Push against the metal upright; push toward the trailer while engaging the black holding piece. That worked for me. YES, those pieces are a big struggle!! We have the Surveyor 235.
The 264 is a very nice unit. Hope you are enjoying it.
2012 F150 FX4 Ecoboost, 2016 Surveyor 274BHS
2003 Yamaha FJR1300, Demco Premiere Slider
1969 John Deere 1020, 1940 Ford 9N, 1948 Ford 8N
Jonsered 535, Can of WD-40, Duct Tape
Red Green coffee mugs