On 2018-01-18 5:05 AM, Thomas Johnson wrote:
> Greetings one and all -
> I have a pair of 5/8" diameter holdfasts that I am wanting to put to work.
> I drilled a 5/8" diameter hold and tried to ream it out a bit with the 5/8"
> bit but the bench is 4" thick at that point (hard maple) and I clearly am
> going to have to open up the holes a bit.  So here's my question - what
> size hole is recommended?  I'm clearly going to have to go on-line and buy
> a 21/32 bit ... or 11/16"?  I'm cheap.  I don't want to but a 21/32 and
> find out it's too small - or a 11/16 and find out it's too big.

Suggest you try counterboring one hole from below with a 3/4 or 7/8" bit 
to see if that creates enough wiggle room. Try 1/2" or so at a time 
until you find the sweet spot.

FWIW

Don

-- 
"You can tell a man that boozes by the company he chooses"
The Famous Pig Song, Clarke Van Ness

The harder they come, the bigger they fall." Ry Cooder