This extender can with used with a Takahashi FS60CB(FL355mm) to convert it to FS60Q (FL600 MM)
I use the scope as an FS60CB all the time so this extender does not get used.
Purchased from AEC
Condition like new with dust caps.
Price 260. Pickup ideal. Postage extra .I can post through Auspost with good packing.
PM if interested.
Any questions welcome.
Vaidya