Johnv is down as a wheelwright or similar in all the records that I've looked at. I know of at least 2 smithys/forges in Chirk -
A smithy on Station Road, close to the main village. It was a cafe by my time!
The Forge, in Pontyblew, at the eastern edge of the parish on the Ceiriog, just before it flows into the Dee. My grandmother was born there.
Possibles - I think there was also one east of the Castle, one at Whitehurst and one at Pentre.
Was David's birth registered in the WRexham RD or Oswestry?
Gadget