Today's Not Too Painful Machining Discovery

I have been using E-Z Lock 3/8"-16 to 1/2"-13 adapters for some time.  Some casters are 1/2"-13; the cheaper ones are 3/8"-16.  To avoiding making the plastic inserts in two different threads, or worse, tap them for each order, I just tap the inserts 1/2"-13, and use the E-Z Loks if a customer orders the cheaper 3/8"-16 casters.

A simple solution, but sometimes the E-Z Loks do not go in the 1/2"-13 holes.  I found that putting a 3/8"-16 bolt through and then using a ratchet wrench put them in, but not always.  Unlike steel bolts, the E-Z Loks require the tapped hole to be countersunk.  Problem solved!