Theoben air gauge

[Jess]

Hi Iv got an original theoben air gauge and when fitted to my 177 it restricts power can this be drilled out to let more air in thanks

[Squinty]

Does the thread have a waist and hole that aligns with the port?


Instructions for fitting a .177 cal or FAC rated
Inlet Adaptor or Pressure Indicator Adaptor
1 Screw in inlet adaptor (part no. 2) and tighten with a 0.826 inch
(21mm) spanner (wrench).
2 Put a mark on the inlet adaptor in line with the barrel above using
a magic marker pen.
3 Drill a 0.156" (4mm) hole in the groove between the two threads.
4 De-burr using a needle file - both inside and out. Ensure that the
whole inlet adaptor is clean and that there is no filing dust or swarf
left aroung the de-burred areas, as this may cause the rifle to leak.
5 Carefully replace the o-ring.
6 Smear a small amount of Molykote 33 grease around the o-ring.
7 Screw into the Rapid (Super 12) body & tighten with spanner.
This will give an uninterrupted route throught the inlet adaptor and up
into the valve chamber.

[Jess]

Thanks mate really appreciate that mine hasn't got any holes in it

[KCE]

Nice one Squinty.
Always good to help out fellow members.
Regards kev.

[Jess]

Does it need drilling both sides or just one side as my bottle adapter what's in got 2 holes thanks

[Squinty]

only really needs one, I reckon most people just drilled straight through thinking that double the holes double the flow.
But that would need an intermediate transfer port twice the size. ?

I've got FAC fast flows with 4 holes in the waist ..made no difference.

[KevG]

Its not critical for hole to line up especially on sub 12 ftlb.may help a little at fac.
KevG

[Jess]

Thanks for the advice