Finally got the assembly done . Made carriage wheels from steel caster wheels $8.99 ea
Turned the casters to what I thought looked good .
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After a bit of puzzelment I welded the carriage together .
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After a few test firings it is good to go !
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Next one will look better , I hope

The bore is 5/16" . I made a ram rod to clean out the primary fire cracker .
Firing it with breech open the rear ignitor cracker stays in place .