has any one tried a huma reg in their rapid HM1000X ?

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Yes I have fitted a couple now, very consistent and gained a bit more powe but be sure you order the correct one as there are two thread sizes, one for the older X blocks and one for newer X HP blocks.
Also, as far as I know there are no current reg testers that accommodate the newer thread so you need to set the reg with a gauge on the block.



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Bb
 
Yes they say the measurements of the threads outside or major of the thread 16.6 16.7 which is the hm1000 reg they got labeled and 19 mm hm1000x I just ordered one for my hm1000x my major of my threads were 16.5 but my hm1000x is older so I ordered the hm1000 reg from huma my s/n starts with hm also and the newer hm1000x s/n starts I guess with hmx so I hope I got the right one coming