Hello! I hope you find this information useful.
I bought a Rodzilla Raptor earlier this year and I ran alongside it a Garmin Xero C1 Chronograph on its included small tripod. This setup leaves something to be desired, so I pursued a direct mounting solution for the chronograph onto the rest itself. I wanted something fast, simple, and not bulky.
The Rodzilla Rests feature two vertical posts. On newer production models, the tops of those posts are threaded 3/8-24. My understanding is older production rests are not threaded, but per Rod himself, you can drill and tap them. If you are going to drill and tap those, I would drill and tap it 1/4-20 to eliminate the threaded insert noted below.
The bottom of the Garmin is threaded in the standard camera/tripod thread pitch of 1/4-20. So we are starting with 2 sets of female threads with 2 different thread pitches. Joy.
I converted the threads on the Rodzilla from 3/8-24 to 1/4-20 using a Threaded Insert from McMaster Carr. This threaded insert features a slot so you can screw it in with a flat blade screwdriver, and it also features a patch of Loctite adhesive. This threaded insert is shorter in length (3/8") than the depth of the bore on the Rodzilla (depth unknown), so I simply screwed it down to flush, let it cure overnight, and it has not moved.
I then installed a male 1/4-20 to male 1/4-20 tripod screw adaptor down into the McMaster threaded insert. I snugged it down with one ugga-dugga of hand strength and it has not required any threadlocker to stay put. I have been able to remove it and re-install it without issue, but I prefer to leave it installed due to its unobtrusiveness.
Lastly, I needed a mechanism to index the chronograph so that the screen faces me and the radar points down range. Screwing it down onto the threaded post until snug did not provide the proper index. I solved this problem with an o-ring. The bottom of the threaded posts feature an area free from threads that is perfect to house the o-ring and also keeps it in place. The o-ring I am using has a 4 mm ID, a 9 mm OD, and is 2.5 mm thick.
When installing my Garmin on the threaded post, the last 90 degrees of turn compresses the o-ring. By the time the screen is facing me, it is quite snug. This thing will not budge under recoil and It's reading 100% of my shots. I would not want to twist it any tighter for fear of breaking the Garmin's plastic housing, but I think this o-ring is just about perfect. If a guy was concerned about too much tension in the o-ring, he could try the alternative part listed below that is 4 mm ID, 8 mm OD, and 2 mm thick.
All in all I am very happy with this. Here is the parts list with links:
Threaded Insert - McMaster Carr - Part No. 94165A235
1/4-20 to 1/4-20 Threaded Posts - Amazon - ASIN No. B018SMYL9M
O-Ring 4 mm 9 mm 2.5 mm - Amazon - ASIN No. B00CFNQ60I
Alternate O-Ring 4 mm 8 mm 2.0 mm - Amazon - ASIN No. B07F37KYZZ
And some pics:
I bought a Rodzilla Raptor earlier this year and I ran alongside it a Garmin Xero C1 Chronograph on its included small tripod. This setup leaves something to be desired, so I pursued a direct mounting solution for the chronograph onto the rest itself. I wanted something fast, simple, and not bulky.
The Rodzilla Rests feature two vertical posts. On newer production models, the tops of those posts are threaded 3/8-24. My understanding is older production rests are not threaded, but per Rod himself, you can drill and tap them. If you are going to drill and tap those, I would drill and tap it 1/4-20 to eliminate the threaded insert noted below.
The bottom of the Garmin is threaded in the standard camera/tripod thread pitch of 1/4-20. So we are starting with 2 sets of female threads with 2 different thread pitches. Joy.
I converted the threads on the Rodzilla from 3/8-24 to 1/4-20 using a Threaded Insert from McMaster Carr. This threaded insert features a slot so you can screw it in with a flat blade screwdriver, and it also features a patch of Loctite adhesive. This threaded insert is shorter in length (3/8") than the depth of the bore on the Rodzilla (depth unknown), so I simply screwed it down to flush, let it cure overnight, and it has not moved.
I then installed a male 1/4-20 to male 1/4-20 tripod screw adaptor down into the McMaster threaded insert. I snugged it down with one ugga-dugga of hand strength and it has not required any threadlocker to stay put. I have been able to remove it and re-install it without issue, but I prefer to leave it installed due to its unobtrusiveness.
Lastly, I needed a mechanism to index the chronograph so that the screen faces me and the radar points down range. Screwing it down onto the threaded post until snug did not provide the proper index. I solved this problem with an o-ring. The bottom of the threaded posts feature an area free from threads that is perfect to house the o-ring and also keeps it in place. The o-ring I am using has a 4 mm ID, a 9 mm OD, and is 2.5 mm thick.
When installing my Garmin on the threaded post, the last 90 degrees of turn compresses the o-ring. By the time the screen is facing me, it is quite snug. This thing will not budge under recoil and It's reading 100% of my shots. I would not want to twist it any tighter for fear of breaking the Garmin's plastic housing, but I think this o-ring is just about perfect. If a guy was concerned about too much tension in the o-ring, he could try the alternative part listed below that is 4 mm ID, 8 mm OD, and 2 mm thick.
All in all I am very happy with this. Here is the parts list with links:
Threaded Insert - McMaster Carr - Part No. 94165A235
1/4-20 to 1/4-20 Threaded Posts - Amazon - ASIN No. B018SMYL9M
O-Ring 4 mm 9 mm 2.5 mm - Amazon - ASIN No. B00CFNQ60I
Alternate O-Ring 4 mm 8 mm 2.0 mm - Amazon - ASIN No. B07F37KYZZ
And some pics:
