diff --git a/pgvectorscale/src/access_method/sbq.rs b/pgvectorscale/src/access_method/sbq.rs
index a62219d..ca998fd 100644
--- a/pgvectorscale/src/access_method/sbq.rs
+++ b/pgvectorscale/src/access_method/sbq.rs
@@ -117,7 +117,7 @@ impl SbqMeans {
                 quantizer
             }
             _ => {
-                pgrx::error!("Invalid page type for SbqMeans");
+                pgrx::error!("Invalid page type {} for SbqMeans", page_type as u8);
             }
         }
     }
diff --git a/pgvectorscale/src/util/chain.rs b/pgvectorscale/src/util/chain.rs
index 4b584a6..aadf980 100644
--- a/pgvectorscale/src/util/chain.rs
+++ b/pgvectorscale/src/util/chain.rs
@@ -147,3 +147,43 @@ impl<'a, S: StatsNodeRead> Iterator for ChainedItemIterator<'a, S> {
         }
     }
 }
+
+#[cfg(any(test, feature = "pg_test"))]
+#[pgrx::pg_schema]
+mod tests {
+    use pgrx::{pg_sys, pg_test, Spi};
+
+    use crate::access_method::stats::InsertStats;
+
+    use super::*;
+
+    fn make_test_relation() -> PgRelation {
+        Spi::run(
+            "CREATE TABLE test(encoding vector(3));
+        CREATE INDEX idxtest
+                  ON test
+               USING diskann(encoding)
+                WITH (num_neighbors=30);",
+        )
+        .unwrap();
+
+        let index_oid = Spi::get_one::<pg_sys::Oid>("SELECT 'idxtest'::regclass::oid")
+            .unwrap()
+            .expect("oid was null");
+        unsafe { PgRelation::from_pg(pg_sys::RelationIdGetRelation(index_oid)) }
+    }
+
+    #[pg_test]
+    fn test_chain_tape() {
+        let mut stats = InsertStats::default();
+        let index = make_test_relation();
+        let mut tape = ChainTapeWriter::new(&index, PageType::SbqMeans, &mut stats);
+        let data = b"hello world";
+        let ip = tape.write(data).unwrap();
+        let mut reader = ChainTapeReader::new(&index, PageType::SbqMeans, &mut stats);
+        let mut iter = reader.read(ip);
+        let item = iter.next().unwrap();
+        assert_eq!(item.get_data_slice(), data);
+        assert!(iter.next().is_none());
+    }
+}
diff --git a/pgvectorscale/src/util/page.rs b/pgvectorscale/src/util/page.rs
index 97383d2..741fe0b 100644
--- a/pgvectorscale/src/util/page.rs
+++ b/pgvectorscale/src/util/page.rs
@@ -32,9 +32,8 @@ pub enum PageType {
     PqQuantizerVector = 3,
     SbqMeansV1 = 4,
     SbqNode = 5,
-    MetaV2 = 6,
-    Meta = 7,
-    SbqMeans = 8,
+    Meta = 6,
+    SbqMeans = 7,
 }
 
 impl PageType {
@@ -44,15 +43,15 @@ impl PageType {
             1 => PageType::Node,
             2 => PageType::PqQuantizerDef,
             3 => PageType::PqQuantizerVector,
-            4 => PageType::SbqMeans,
+            4 => PageType::SbqMeansV1,
             5 => PageType::SbqNode,
-            6 => PageType::MetaV2,
-            7 => PageType::Meta,
+            6 => PageType::Meta,
+            7 => PageType::SbqMeans,
             _ => panic!("Unknown PageType number {}", value),
         }
     }
 
-    /// `Tape` supports chaining of pages that might contain large data.
+    /// `ChainTape` supports chaining of pages that might contain large data.
     pub fn is_chained(self) -> bool {
         matches!(self, PageType::SbqMeans)
     }
@@ -144,12 +143,6 @@ impl<'a> WritablePage<'a> {
         unsafe { self.add_item_unchecked(data) }
     }
 
-    pub unsafe fn replace_item(&mut self, offset: OffsetNumber, data: &[u8]) {
-        let result =
-            pg_sys::PageIndexTupleOverwrite(self.page, offset, data.as_ptr() as _, data.len());
-        assert!(result);
-    }
-
     pub unsafe fn add_item_unchecked(&mut self, data: &[u8]) -> OffsetNumber {
         let size = data.len();
         assert!(size < BLCKSZ as usize);
diff --git a/pgvectorscale/src/util/tape.rs b/pgvectorscale/src/util/tape.rs
index 7e18aa0..b1ce88b 100644
--- a/pgvectorscale/src/util/tape.rs
+++ b/pgvectorscale/src/util/tape.rs
@@ -121,19 +121,6 @@ mod tests {
                 node_page
             };
 
-            {
-                let mut tape = Tape::resume(&indexrel, PageType::SbqMeans);
-                let ip = tape.write(&[99]);
-                assert_eq!(
-                    ip.block_number, tape.current,
-                    "Tape block number should match IP"
-                );
-                assert_ne!(
-                    tape.current, node_page,
-                    "Data can only be written to page of its type"
-                );
-            }
-
             {
                 let mut tape = Tape::resume(&indexrel, PageType::PqQuantizerVector);
                 let ip = tape.write(&[99]);