Hey i have the set up your talking about. the pvc tube with the end cap on my tinnie. works perfect. have not had it break or crack. i just used bolts straight through it and a peice of timber on the inside to add strength. You use the holes in it to use a socket to put through to bolt it just use an extension bar. And i use a broom stick with heaps of screws through it as the masher just use 100mm screws and go straight through leave half out each end. See on the back of my tinne.