Drop in R&D

[102511]

My cylinder was on my steps when I got home on friday. Its a non gated drop in and its going on a pietta 1851 navy in .44. Like all parts that say drop in it doesnt drop in. When I try to slip it on the arbor/base pin it goes on 1/2 inch and then starts to bind. I can slip the back plate and cylinder on separately and have no binding. I think the base pin holes are not on center between the 2 parts. When I get the cylinder on it indexes fine but it will only rotate for 3 chambers then on the 4th it wont turn at all. I cant even get the the hammer back. Im home sick today so I have time to mess with stuff. Any tips for fitting this thing. I dont want to pay $15 plus $40 shipping for R&D to fit it for me.

[Flint]

The only thing that makes sense is the index pin must be mis-located.  Feel the edges of the joint with the cylinder and backplate assembled, see if you can feel an off center situation near the index pin and across from it.  Perhaps a rap on the edge of the backplate where you might feel the edge is above the cylinder surface might recenter the arbor holes.

Or send it back.

[102511]

Thanks for the reply Flint. I looked and there is a small overhang but its nothing to big. I did notice that the finish on the back plate is thinning out from rubbing on something. Its inbetween 2 firing pins and its the same spot where the cylinder binds up.  I think its rubbing on the ring on the frame that covers the ratchet teath.  I think Ill try to exchange it and if that one doesnt work Ill send the gun in.