shears (thats what i used to cut it up)
1 can of bondo, 1 tube of bondo spot putty
The plastic (I used styrene)
Heat source for bending the plastic (I used a bic lighter)
Glue (Plastic weld)
various grits of sand paper from seriously rough to fine
and last but not least I used the measurements from TK-409's web site
I appreciate it......Lemme know if I can help you with anything and Good luck!!
Oh yeah, after you trim the visor and ears off the batting helmet turn it backwards (so your dent will be on the back of the batting helmet if that makes sense)
I didn't measure it when I cut it. I just cut it right above the curves where the visor of the batting helmet ended. I took a piece of long masking tape and wrapped it around the whole dome so it was straight and went at it with the shears. I can tell you that from the top of my browline under the triangle "directionals" to the top of the brow above the keyslot area is 14 3/4 inches right over the top following the curve of the dome. Hope that helps.