Joined: Dec 2019
Posts: 2,841
Likes: 1,062
From: South Shore of Long Island
Bikes: 2010 Carrera Volans, 2015 C-Dale Trail 2sl, 2017 Raleigh Rush Hour, 2017 Blue Proseccio, 1992 Giant Perigee, 80s Gitane Rallye Tandem
I'm not always good with pictures but it looks like there might be enough threads engaged, usually the top cap is threaded almost all the way to the end. If that's a spacer in there you can remove it and stick in a thinner one. I suspect its probably fine but it should have been a touch longer.