[R-390] Strange BFO backlash explained!

[Tim Shoppa]

You guys may remember me asking about a strange BFO backlash that
I had with my yellow striper's IF deck last summer. It manifested
itself sometimes, and not others, and while I had dinked around with
it I never thoroughly understood the cause.

Now that I'm putting that deck back together (I had to pull the
BFO reactor to get at and replace the V505 socket, which had
crumbled into dust over the years) I can understand the cause: the
shaft of the BFO reactor shifts in and out a little bit. I don't
know if this is "typical" or not, but seeing as how the internals
work it makes perfect sense that this causes backlash.

The springy-thing shaft coupler can be adjusted to provide enough
tension over the working range that this problem is at least minimized.

Is the BFO reactor shaft really supposed to have this much (I'd guess
1/32") wiggle in and out? I'd be very surprised if so...

Tim.