EDIT:
this is for the DAMAGED BOLT ONLY.....


completely ignore the old bolt as any part of the structure...... "levelling point" included ... it WILL cause you grief

your better off chipping away some of the concrete around that bolt, cutting the bolt off below 'ground level' and filling the recess with the epoxy to seal it off completely.


step 1
mark and drill a new hole in the base plate, stand frame in position and drill through that hole into the concrete

step 2
remove frame and do the 'fix' I've suggested to the old bolt.

step 3
replace frame and add the epoxy and the new bolt....... walk away, no more to pay




tools etc required:

hammer drill - builders or local construction firms WILL have one (borrow corosponding drill bit aswell)

drill capable of drilling through the steel base-plate and again a drill bit to suit.

air compressor & blower nozzle - you'll need to blow away ALL the dust etc before the epoxy is added
*** NB: the epoxy will NOT work 100% if the area is contaminated with dust or moisture ***


all thread - cut it to desired length ..... this is your 'new bolt'
here is Australia we have a fully threaded rod usually a yard in length we call "all-thread", the thread that's in the epoxy provides far more grip over a plain shanked normal bolt that's had the head cut off.

epoxy - here is Australia we call it "chemset", I'm sure the USA has a similar product.




Tip:
chemset cures fast..... you wont have time to stuff around with it, especially if its a warm day
So a practise 'dry run' or 2 is a good idea.

Placing the bolt in the chemset:
you need to fill the bottom 1/3rd of the hole with chemset, push the bolt in till you get the height you want, jiggle the bolt up & down slightly several times to squeeze out any air trapped in the hole, a nut & washer should then be added and let them sit at the base plate to hold the bolt from slipping further into the hole than desired




Kingy