diff --git a/satrs-example/src/acs/mgm.rs b/satrs-example/src/acs/mgm.rs
index eb2ebec..d0729c6 100644
--- a/satrs-example/src/acs/mgm.rs
+++ b/satrs-example/src/acs/mgm.rs
@@ -74,6 +74,7 @@ pub struct MgmHandler<ComInterface: SpiInterface, TmSender: EcssTmSenderCore> {
     #[new(default)]
     rx_buf: [u8; 12],
     #[new(default)]
+    tm_buf: [u8; 12],
     stamp_helper: TimeStampHelper,
 }
 
@@ -135,10 +136,11 @@ impl<ComInterface: SpiInterface, TmSender: EcssTmSenderCore> MgmHandler<ComInter
                 );
                 // Let's serialize it as JSON for now.. This is a lot simpler than binary
                 // serialization.
-                let mgm_data_serialized =
-                    serde_json::to_vec(&*self.shared_mgm_set.lock().unwrap()).unwrap();
-                let hk_tm =
-                    PusTmCreator::new(&mut sp_header, sec_header, &mgm_data_serialized, true);
+                let mgm_snapshot = *self.shared_mgm_set.lock().unwrap();
+                self.tm_buf[0..4].copy_from_slice(&mgm_snapshot.x.to_be_bytes());
+                self.tm_buf[4..8].copy_from_slice(&mgm_snapshot.y.to_be_bytes());
+                self.tm_buf[8..12].copy_from_slice(&mgm_snapshot.z.to_be_bytes());
+                let hk_tm = PusTmCreator::new(&mut sp_header, sec_header, &self.tm_buf[0..12], true);
                 self.tm_sender
                     .send_tm(self.id.id(), PusTmVariant::Direct(hk_tm))
                     .expect("failed to send HK TM");