The Vixen 36.4mm adapter has been a life-saver for many of us, easily converting many older refractors to 1.25", from the .965" size they were sold with.
Let's look at it, as well as some alternatives.
Here is the Vixen adapter, threaded-on two different APL focusers, a Monolux and a Manon. It fits perfectly. Typically under $30 from North American dealers, about $15 directly from Japan but you have to wait longer.
Thank you for the very informative post!
I want to update the current pricing on this part for Japan as found on eBay. If someone knows another source direct from Japan, please post.
Currently there are about 8 of these listed on ebay. The lowest price is $21.99, shipping included. The next lowest is $37 and change.
I have at times looked for these on eBay over many years. The pricing and availability is often in flux. Check back in 6 months and it will likely different.
In the US the Vixen importer currently sells these for $24.95 plus shipping and tax.
If I'm not in a hurry for something like this I often try a wanted ad here on CN.