Adapting older Burnerd collet chuck to receive newer style collets

When I acquired a Burnerd collet chuck for my Colchester Student lathe it came with just 3 of the 11 collets which comprise the full range. To make a up a full set I had the option of purchasing individual collets piecemeal or a whole set. Finally one came up at the right price but it was of the newer design where the collet fingers are flush with the face of the chuck. I was reasonably sure that the older and newer collets are interchangeable in the collet chuck but it wasn't until I was able to measure them that I could be sure.
Apart from this the bore in the adjusting cap needed to be enlarged to accept the newer design of collet. This required some turning of tough steel for which I invested in a carbide insert tool holder.
I conducted some concentricity tests with various diameters of bar. By dressing the nose spindle on the lathe I was able to improve run out.

00:00 Looking at recently acquired Burnerd collet chuck set
00:32 Inspecting disassembled collet chuck on bench
06:13 Checking concentricity of chuck body
07:31 Checking concentricity of sleeve in the body
09:18 Identifying best angular position for sleeve
11:37 Why the sleeve is keyed to the body
12:25 Determining best position of keyway in sleeve
13:32 Attempting to clean up nose taper on the lathe
15:49 Retesting the body after cleaning up the nose
18:27 Milling new slot in sleeve
19:45 Cleaning up yoke assembly
23:26 Reassembly
27:17 Turning test bar using collet chuck
29:51 Conclusion and next video