Checking out a used singer 111w155

[Gufnstuf]

I’ve been reading a great deal of posts here and gathered a lot of information from you all. 
I have a singer 16-188 that I have been using and I am going to look at a 111w155 on Saturday. Do you have any pointers I should examine while checking out the machine?

I am pretty technical but never had my hands on one of these.

thanks

[CowboyBob]

Grab theneedlebar & push it front to back to check for play,make sure the hook tip is good & that the bobbincase isn't too loose.Then some samples of what you want to sew along with some thread ( in case they don't have any) & see if it will sew your material ok.These are great machines just keep it oiled good & all the parts are still available.