Tuning BEST Fittings Theoben Rapid 7 Reg Tester - 03T1 RT01

[Odoyle]

26fps spread won't show on a 100 yard target.

 

[SpiralGroove]

I would start from scratch if I were you, 

Remove the reg nut, the flat washer and all the belville washers.

push the core in as far as it goes and measure total length from the front of the reg to the back of the core, note the dimensions.

Pull the core back as far as it will go and measure again, the total travel of the core should be between 0.3- 0.5mm.

Use the brass locking nut to make adjustments.

Rebuild the stack of belville washers so it looks like this (())(())(())(([]nut

then make fine adjustment on the reg nut 1/6 turn at a time until you set pressure 



Bb

Hey Bucket Boy,

I've recently taken apart my RAW regulator and measured the Core's travel to be .84mm. This is significantly beyond the range you specified above. However, when the brass nut is unlocked and re-tighten, it has no affect in locking the core to a different position? The range of movement is as before. What am I missing?

Thanks,

Kirk

 

[Gear_Junkie]

Following - Great info in this thread!

 

[corny]

Unfortunately yes. Different thread on the later Hm1000x, I don’t know why or what the thread is but the older theobens and RAW were 3/8 19bsp



Your other BM and TM regs should fit but you need to fit a fatter o ring to get them to seal as the best fittings tester has been Machined incorrectly (they get very upset when you tell them) 

A simple solution is to fit a gauge to the bottom blanking plug of the block and test the reg in situ 

photo are not loading I will try a pm



Bb

Hm1000x reg thread is 3/4 16 UNF 

I just bored and retreaded my best fittings reg tester. worked very well. 
the oring seat has to be modified as well, hmx uses .7551x.08” 

the oring seat on the tester is .1” deep. So I had to shorten the piece by .02”

Very simple mod with calipers and lathe 

 

[SpiralGroove]

Unfortunately yes. Different thread on the later Hm1000x, I don’t know why or what the thread is but the older theobens and RAW were 3/8 19bsp



Your other BM and TM regs should fit but you need to fit a fatter o ring to get them to seal as the best fittings tester has been Machined incorrectly (they get very upset when you tell them) 

A simple solution is to fit a gauge to the bottom blanking plug of the block and test the reg in situ 

photo are not loading I will try a pm



Bb

Hm1000x reg thread is 3/4 16 UNF 

I just bored and retreaded my best fittings reg tester. worked very well. 
the oring seat has to be modified as well, hmx uses .7551x.08” 

the oring seat on the tester is .1” deep. So I had to shorten the piece by .02”

Very simple mod with calipers and lathe 

I never thought of doing that ..... how much do 3/4" 16 UNF taps go for?

 

[corny]

I’m sure cheap ones can be had for $15-20 

more expensive one closer to $50