OK Bart, I have some of those, never heard them called hanger bolds
though, come to think of it, we call them WC bout G

If I would have to do this, I would get my dial calipers out, measure
the outside thread dimension and shaft size, then take a scrap piece and
drill a hole that would give me approx., 75% thread depth so lets say
the shaft is 6 mm and the outside thread dim. is 10 mm then your
difference is 4 mm, then you want 3 mm thread depth, and you drill your
hole 7 mm, now screw in your bold, you can saw the thread of your bold
so that it will cut tread, that helps, and you could also put some wax
on your bold, that helps also, if your wood splits you will have to go
bigger with your drill size, 75% thread depth is typical for tapped bolt
thread, I don't know if 75% is realistic for a wood screw, that does not
tap its thread but forces the wood open, I think that your best bet is
to saw the thread on your bold deep enough, like a tread tap, and clamp
the wood to prevent it from splitting, turn the bold in and out clean
and wax, and turn back in, by then I think you will feel how tight the
bold is, make sure you try on a scrap piece that is if not the same at
least as hard and solid as the wood your going to use for real, the best
I can do for you, good luck.
Ik woon in london je can me bellen of e mail me, ok?

Have fun and take care
Leo Van Der Loo


Bart V wrote:

You could take a piece of scrap wood and drill a 9/32" hole and test the
bolt in the hole. Alternatively you could use a 5/16" drill and this would
be more that sufficient


I didn't know what a hanger bolt was until I saw one either Ok,
it's a two-sided fastener - one side is a regular woodscrew, the other
side is a bolt.
The end I'm talking about is the woodscrew part, it's 1/4" alright so
I need to drill a hole that is smaller than 1/4" else the screw
threads cannot bite into the wood as I'm screwing it in. So I guess my
question is, how much smaller? My concern of course, too small and the
wood of the neck will split, or too big and the screw won't hold. Oh
and to be sure, the [banjo] strings will put a ridiculous amount of
tension this connection/joint that's why I was wondering about the
soaking in oil thing.
On a personal note, being able to someday make my own banjo is what I
got my lathe for in the first place. Well, that and also to get rid of
the pile of wood in the basement I'd been stashing cause them pieces
were just too pretty for the fireplace. It's really unbelievable the
kinda stuff you can score at a pallet factory's "free firewood"
dumpster... My wife is happy that the wood stash in the basement is
getting smaller although the mantle is starting to buckle trying to
support all them purdy new round thingies
Bart.
P.S. Leo, zou graag eens met je babbelen
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