Just got new clock back. It wont seem to go back into place. its like the outer clock lip is just a hair off and wont slide back in. I have tried put the top of lip in and pushing up on it and dash but still wont do. 

Any tips on getting it back in without screwing something up? 

A task better best attempted in warm weather I expect. Perhaps a really warm garage.

I rolled up some thin mylar and put that in from the front, to assist with getting past the dash inside lip. 

45 minutes ago, Terrapin Z said:

 Perhaps a really warm garage.

Its in a garage, fairly warm. However, i get your point. Maybe i will try a hair dryer on the spot. 

I tried to grease it up...didnt work

As a last resort i though about getting a dremel with a sanding bit and taking off a smidgen around the edge. Dont want to but you wont see 

that anyway.

whew... i got the clock in but some of the edges of dash  around clock gave way. anyone got suggestions on what kind of spray foam material might work to try and build area up a little

I would go with a bead of black silicon given how old the dash foam is, and the potential adverse interaction with products containing isocyanates.