I had another play with things last night, bought some replacement screws and washers and doubled up the washers to give the screws a chances of gripping more, as you said the new bucket is definitely thinner plastic than the kettle the element came from. After refitting the 2 elements it was the same story, OK initially but came back 10 minutes later to a bit of a leak from both elements. At this point I decided even if I got them to seal just using the provided parts I wouldn't be confident in it staying that way, so I broke out the PTFE tape. I gave the rubber gaskets 5 wraps or so and reattached them, put everything back together and left it for 20 minutes, no leaks. Left it overnight with water in and all good, so I think PTFE tape is the way forward. It has also stopped the elements from rotating so freely, they feel a lot more sturdy. Do you think there could be any further issues when everything heats up?the bazooka filters are used by quite a lot of people without problems, I have never used one so cant really comment, but i doubt you will have any problems as long as you:
a) open the tun drain valve gradually and not quickly to wide open letting the flow build gradually and not suck grain husks all over the filter surface in one with a quick open to full.
a gentle crank open while u count to 10 will create a gentle growing flow
b) avoid heavy wheat grainbills, but if you do need to brew with significant wheat volumes simply batcch sparge and use a net bag to contain the grain it will aid the flow significantly.
a net containing bag may not be so good if you fly sparge as the liquor can run down the side of the bag without draining through the grain..
IF you do have problems you will at least have the extranal valve and connection to a method of fitting a more traditional manifold, though you could also go false bottom
for bog standard kettle elements you need a hole 38-40mm, i would always cut 38mm as its a standard hole saw size and a hole can always be fettled a bit bigger.. while trying to fit in a tad too big hole is a pita.
Never fear this is old well covered teritory the best tools to sealing are
1) rolls of ptfe tape ( yes rolls plural)
2) a ���ãshop or similar silicone baking sheet or cake mould with a large flat surface,
3) last bastion, fernox lsx silicone thread sealer, though thats only gonna be needed where ptfe cant be coaxed, and isnt very nice when curing, but when cured is an almost pure silicone passed for use with pottable water and hot water.
#1 please have a nice clean cut hole, if not clean it up so its all smooth.
however it sounds like your bucket wall is probably a bit thinner than the kettle wall the element came from and the screws may be a tad too long, so first add a few spacing washers under the retaining screw heads to tighten up the grip.
if that fails you can bulk up the seal i would try and use ptfe tape where possible, but silicone bakingshhet can be slightly undercut to create soft hugging washer layers silicone sold for home baking is food and heat safe as is ptfe
anything you cant seal with copious wraps of pfte or diy silicone baking sheet washers can be plugged with the LSX thread sealer, nasty until cured, it will cure into almost pure silicone, but unlike kitchen/bathroom silicone sealing products has no antifungal etc ingredient so if left wet/damp and warm watch out for black mould ingress..
fwiw i used lsx to seal the base drain flange on my tun against its bottom skin - 3 years in with dry storage - no probs..
With regards to the bazooka filter, would it be any good for filtering a boil kettle instead? I was thinking I could move it over and make a manifold as I already have a lot of copper elbows in 15mm and 22m from doing my bathroom so could probably get a sparge arm and manifold made out of 1 length of pipe.
Got two ball valves/tank connectors/hose barbs on the way, hoping they come today and I can install them tonight. Planning on doing my first brew day on Saturday.