Hmmm,
Certainly an older tube maybe from the mid 90's..........
You'd need to check carefully which model micro focuser would fit.
(I can't find a link for the Celestron version, but the Feathertouch site gives some details:
http://starlightinstruments.com/stor...product_id=261)
JMI still seem to offer a electronic focuser motor which could fit.
http://www.jimsmobile.com/buy_motofocus.htm#Celestron