Just get a 3/8 aluminum tube, and cut the length you need with some small pipe cutters, and squish it gently with a pair of pliers, then stick it on with a good glue , goop is great.
thanks guys for providing me many creative solutions for that part. it's kinda frustating when found out [after few days of my 2nd troopin] i lost that part. i learnt my lesson then. :cheers