J
I absolutely love Rogers Drums.
What do the paper tags say on your drums?
The cymbal arm on the BD definitely is not original to the set. The collet had to be spread pretty good to get that 11mm rod into it. Give me the serial number range on the tag, and I can give you a decent estimate on a year. They will be 1963-late 66, early 67.
Here is a pic of the correct cymbal arm for the telescope mount....it is a 3/8 chrome plated hex rod that mounts a Rogers cymbal tilter on top. Any where from 60-120 dollars on the used market.