I have a Remington #4 rolling block in .32 rimfire and have just purchased some cases from Dixie Gun Works that allow me to shoot it by using a blank or drawn .22 cartridge as ignition. Havent had a chance to use them yet but looks like a good solution and allows you to keep your rifle original. Try and get .32 long cases as they sent me .32 short.

Harry Pope just had different length links so he could use his personal high wall as a centerfire in the summer and then shoot .22 rimfire in the winter (indoors).

Not a major project at all.

Green One,

I remember the info on Pope's system as having the eccentric pin as well. Also recall a rough dimensioned drawing of it too, but I have no idea where I stashed the data after running across it.

possible,

Went through one conversion from 32rf to centerfire a long time ago on my brother's Low-wall. We found out that the firing pin hole through the 32rf breech block was angled differently than that used for a 22rf block, something to take into consideration when determining which spare parts to use for the centerfire conversion as this affects the hole spacing required in the new link to obtain a properly centered primer strike. 

Also noted that the longer link increased tension on the leaf-style mainspring. It wasn't too terrible of a job doing the conversion, but it does take some careful consideration before firing up the mill and cutting chips. Of course, that's always true for anything worth doing.  

Regards,
BP