86 5ktq slave cyl installation problem - ideas?

[Livolsi, Stephane]

Ok, I have a new OEM FAG slave cylinder for the 5ktq. Tranny is still out of
the car.
The slave does not come with a new rollpin and I cannot find any metric
rollpins in my area.  The closest I can find is slightly larger than the 6mm
I need and I don't want to try it for fear of cracking the aluminum tranny
case.
I am thinking of just using a 6 mm high strength bolt and double nut with
lock washer.  (should also make removal a lot easier 5 or 6 years from now
when I have to do the clutch again - won't have to find an 'appropriate'
punch) It appears to me that there is enough of a rim around the hole in the
tranny to seat the nut and bolt properly.
I know, I KNOW, I should just be using the right rollpin, but I can't get
one....

Anybody see problems with this? Have I missed any considerations?

TIA

Stephane