Post-rebuild of my brake distribution block

After cleaning the valve and dist block bore, I found sliding the piston in the first 3/4s of the bore was very easy, but I really had to push it to get it in that last bit to center the valve under the light switch plunger. Has anyone else had this experience? THe good thing is the light is now out, but it seems like it would take alot of force to move the thing now.
 
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