"Sure" rating, e.g. 90 instead of 70. i.e. something a bit tough, but I've never found it that critical. I'd go with Pete's advive though, he's rebuilt more than most of usOriginally Posted by james_stan
Registered User
"Sure" rating, e.g. 90 instead of 70. i.e. something a bit tough, but I've never found it that critical. I'd go with Pete's advive though, he's rebuilt more than most of us
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
Even better looking than a HW35
I just realised I said shaw and it should be shore, I couldn't remember how to spell it when I replied this morning, just woken up and was a bit dopey, as I said (and others) I just use the Meteor size O ring now as they don't seem as tight in the bore, the cylinder threads can be a bit of a pain sometimes when getting the piston back in, when I did the parachute seal conversion (for the life of me I can't remember which rifle in my collection has it in now"Sure" rating, e.g. 90 instead of 70. i.e. something a bit tough, but I've never found it that critical. I'd go with Pete's advive though, he's rebuilt more than most of us) I had to get some very thin delrin sheet and wrap it round the greased up piston head and push it in that way to avoid the threads.
Pete
Far too many rifles to list now, all mainly British but the odd pesky foreigner has snuck in
Registered User
I got fed up with messing with airsporters and mercuries ages ago and had some steel piston heads made up, they take a single o ring and are half the size of the original nylon head so add a little more swept volume as well as the weight - gets the power up easily. you have to extend the cocking slot by a few mm as the piston rests a little further forward but they are an excellent mod, I prefer them to alloy heads.
"But we have our own dream and our own task. We are with Europe, but not of it. We are linked, but not comprised. We are interested and associated, but not absorbed."
Winston Churchill 1930
Registered User
Yeah, I just woke up too when I said "sure"
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.
Registered User
i tried softer shore rated ones in mine the correct size & slightly smaller same as the meteor, lasted a few shots before failing.Maybe I was unlucky with cheap o-rings but I always use the correct ones now & no more problems. Only saying as the're my least favorite rifles to strip because of that curved end block & fine thread to engage on re-assembly.
Registered User
Well I never - I've bought a fair few number of o-rings for motorcycle repairs in the past and never encountered 'Shore rating'. Just bought standard nitrile rings. Every day a school day eh? So looks like meteor ring it is. Is the cylinder much smaller on a Meteor?
Cheers
Jams
Even better looking than a HW35
I believe they are 25mm bore (I know the later Gamo type ones are 25mm), I suppose in theory O rings are only normally used for sealing things and are not really used to being shoved up and down bores at great speed and pressures (but I'm happy to be proved wrong with these sort of applications), so I'd expect a harder shore is needed in this case.
Pete
Far too many rifles to list now, all mainly British but the odd pesky foreigner has snuck in
Registered User
OK so I'm up for a bit of experimenting here.. I bought a couple of 22mm id 3mm cs O-rings (shore70) to see how they would fit.. Easy on to the piston and slides nicely
into the bore with some but not a huge amount of resistance - feels pretty good. I have some concerns about the 'side slop' in the 3.5mm groove but the proof of the pudding and all
that. Hope I can the old girl back together tonight for a test out.
Cheers
James
Posting Permissions
Reply With Quote
